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a{display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;font-size:0.75rem;-webkit-box-pack:center;-ms-flex-pack:center;-webkit-justify-content:center;justify-content:center;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;}</style><nav class="MuiTypography-root MuiTypography-body1 MuiBreadcrumbs-root css-zmi5yr" aria-label="breadcrumb"><style data-emotion="css nhb8h9">.css-nhb8h9{display:-webkit-box;display:-webkit-flex;display:-ms-flexbox;display:flex;-webkit-box-flex-wrap:wrap;-webkit-flex-wrap:wrap;-ms-flex-wrap:wrap;flex-wrap:wrap;-webkit-align-items:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;padding:0;margin:0;list-style:none;}</style><ol class="MuiBreadcrumbs-ol css-nhb8h9"><li class="MuiBreadcrumbs-li"><style data-emotion="css 1npbk5i">.css-1npbk5i{-webkit-text-decoration:underline;text-decoration:underline;text-decoration-color:rgba(0, 0, 0, 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class="MuiTypography-root MuiTypography-h2 css-t21enm">Isola</h1><style data-emotion="css 1m36rd1">.css-1m36rd1{margin:0;font-weight:700;font-family:Avenir,sans-serif;letter-spacing:-2%;text-transform:uppercase;font-size:1.4375rem;line-height:2rem;padding-top:0.625rem;padding-bottom:1rem;color:#ffffff;}@media (min-width:992px){.css-1m36rd1{font-size:2.125rem;line-height:2.5rem;}}</style><h5 class="MuiTypography-root MuiTypography-h5 HeroBase_leadP__0yoSv css-1m36rd1">Enciclopedia on line</h5></div></div><style data-emotion="css 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css-ljmp5d" data-nosnippet="true"><div class="MuiBox-root css-0" id="categorie"><style data-emotion="css kp7sva">.css-kp7sva{padding-bottom:0.5rem;margin-top:1.5rem;}</style><div class="MuiBox-root css-kp7sva"><style data-emotion="css 1oz9gu8">.css-1oz9gu8{margin:0;font-weight:900;font-family:Avenir,sans-serif;letter-spacing:-2%;font-size:0.75rem;line-height:1.125rem;}@media (min-width:992px){.css-1oz9gu8{font-size:0.875rem;line-height:1.375rem;}}</style><span class="MuiTypography-root MuiTypography-bodySBold css-1oz9gu8">CATEGORIE</span></div><div class="MuiBox-root css-0"><a style="margin-bottom:0.5rem;display:block" href="/enciclopedia/tecnologia_e_scienze_applicate/industria/industria_automobilistica_ferroviaria_e_navale/"><style data-emotion="css tg1524">.css-tg1524{margin:0;font-weight:900;text-transform:uppercase;font-family:Avenir,sans-serif;letter-spacing:-2%;font-size:0.875rem;line-height:1em;background-color:rgba(0, 0, 0, .3);padding:0.375rem 1rem 0.0625rem;display:-webkit-inline-box;display:-webkit-inline-flex;display:-ms-inline-flexbox;display:inline-flex;display:inline-block;color:#fff;}@media (min-width:992px){.css-tg1524{font-size:1rem;line-height:1.25rem;}}@media (max-width:991.95px){.css-tg1524{padding-bottom:0.25rem;}}</style><span class="MuiTypography-root MuiTypography-overlineLabel css-tg1524">industria automobilistica ferroviaria e navale in industria</span></a></div><div class="MuiBox-root css-0"><a style="margin-bottom:0.5rem;display:block" href="/enciclopedia/scienze_naturali_e_matematiche/geografia/geografia_fisica/"><span class="MuiTypography-root MuiTypography-overlineLabel css-tg1524">geografia fisica in geografia</span></a></div><div class="MuiBox-root css-0"><a style="margin-bottom:0.5rem;display:block" href="/enciclopedia/scienze_naturali_e_matematiche/medicina/anatomia/"><span class="MuiTypography-root MuiTypography-overlineLabel css-tg1524">anatomia in medicina</span></a></div><div class="MuiBox-root css-0"><a style="margin-bottom:0.5rem;display:block" href="/enciclopedia/arte_lingua_e_letteratura/lingua/linguistica_generale/"><span class="MuiTypography-root MuiTypography-overlineLabel css-tg1524">linguistica generale in lingua</span></a></div></div><div class="MuiBox-root css-0" id="tags"><style data-emotion="css nmceeh">.css-nmceeh{margin-top:1.25rem;}</style><div class="MuiBox-root css-nmceeh"><span class="MuiTypography-root MuiTypography-bodySBold css-1oz9gu8">TAG</span></div><a class="Term_tag__j_oGT" style="padding-top:0.25rem;color:#424242;display:flex;align-items:center" href="/enciclopedia/tag/piattaforma-continentale/"><style data-emotion="css 1fiyhv5">.css-1fiyhv5{margin:0;font-weight:300;font-family:Avenir,sans-serif;letter-spacing:-2%;font-size:0.875rem;line-height:1.375rem;}@media (min-width:992px){.css-1fiyhv5{font-size:1rem;line-height:1.75rem;}}</style><p class="MuiTypography-root MuiTypography-bodyM css-1fiyhv5">Piattaforma continentale</p><style data-emotion="css 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cerebrale</p><span class="notranslate MuiIcon-root MuiIcon-fontSizeMedium icon-right-arrow css-xfgsgz" aria-hidden="true"></span></a><a class="Term_tag__j_oGT" style="padding-top:0.25rem;color:#424242;display:flex;align-items:center" href="/enciclopedia/tag/barriere-coralline/"><p class="MuiTypography-root MuiTypography-bodyM css-1fiyhv5">Barriere coralline</p><span class="notranslate MuiIcon-root MuiIcon-fontSizeMedium icon-right-arrow css-xfgsgz" aria-hidden="true"></span></a><a class="Term_tag__j_oGT" style="padding-top:0.25rem;color:#424242;display:flex;align-items:center" href="/enciclopedia/tag/crosta-terrestre/"><p class="MuiTypography-root MuiTypography-bodyM css-1fiyhv5">Crosta terrestre</p><span class="notranslate MuiIcon-root MuiIcon-fontSizeMedium icon-right-arrow css-xfgsgz" aria-hidden="true"></span></a></div></div><style data-emotion="css 1t9ge1w">.css-1t9ge1w{box-sizing:border-box;margin:0;-webkit-flex-direction:row;-ms-flex-direction:row;flex-direction:row;-webkit-flex-basis:100%;-ms-flex-preferred-size:100%;flex-basis:100%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:100%;}@media (min-width:576px){.css-1t9ge1w{-webkit-flex-basis:100%;-ms-flex-preferred-size:100%;flex-basis:100%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:100%;}}@media (min-width:768px){.css-1t9ge1w{-webkit-flex-basis:100%;-ms-flex-preferred-size:100%;flex-basis:100%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:100%;}}@media (min-width:992px){.css-1t9ge1w{-webkit-flex-basis:58.333333%;-ms-flex-preferred-size:58.333333%;flex-basis:58.333333%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:58.333333%;}}@media (min-width:1200px){.css-1t9ge1w{-webkit-flex-basis:58.333333%;-ms-flex-preferred-size:58.333333%;flex-basis:58.333333%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:58.333333%;}}@media (min-width:1400px){.css-1t9ge1w{-webkit-flex-basis:58.333333%;-ms-flex-preferred-size:58.333333%;flex-basis:58.333333%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:58.333333%;}}@media (min-width:1921px){.css-1t9ge1w{-webkit-flex-basis:58.333333%;-ms-flex-preferred-size:58.333333%;flex-basis:58.333333%;-webkit-box-flex:0;-webkit-flex-grow:0;-ms-flex-positive:0;flex-grow:0;max-width:58.333333%;}}</style><div class="MuiGrid-root MuiGrid-item MuiGrid-grid-xs-12 MuiGrid-grid-lg-7 Term_termContent__UHoTq term-content css-1t9ge1w"><div class="paywall term-paragraph0 Term_elTermParagraph__jPdF6 MuiBox-root css-0"><style data-emotion="css ua2ada">.css-ua2ada{margin:0;font-weight:300;font-family:Avenir,sans-serif;letter-spacing:auto;font-size:1.1875rem;line-height:1.8125rem;padding-top:2.5rem;margin-bottom:1.25rem;}@media (min-width:992px){.css-ua2ada{font-size:1.625rem;line-height:2.25rem;}}</style><h2 class="MuiTypography-root MuiTypography-leadP css-ua2ada"><span id="Geografia" class="mw-headline">Geografia</span></h2> <style data-emotion="css d8t48w">.css-d8t48w{margin:0;font-weight:300;font-family:Avenir,sans-serif;letter-spacing:-2%;font-size:1rem;line-height:1.75rem;}@media (min-width:992px){.css-d8t48w{font-size:1.25rem;line-height:2rem;}}.css-d8t48w:not(:last-of-type){margin-bottom:1.5rem;}</style><p class="MuiTypography-root MuiTypography-bodyL css-d8t48w">Porzione di terraferma completamente circondata dall’acqua e situata in un <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/oceano/">oceano</a>, <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/mare/">mare</a>, <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/lago/">lago</a>, <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/laguna/">laguna</a> o fiume; l’origine delle i. può essere dovuta a movimenti della <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/crosta/">crosta</a> terrestre, <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/erosione/">erosione</a>, <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/vulcanismo/">vulcanismo</a>, deposizione di materiali sedimentari, formazione madreporica. </p></div><div class="paywall term-paragraph1 Term_elTermParagraph__jPdF6 MuiBox-root css-0"><p class="MuiTypography-root MuiTypography-bodyL css-d8t48w">L’estensione complessiva delle i. supera i 10 milioni di km<sup>2</sup>. Le i. marine più importanti e numerose, rispetto a quelle fluviali e lacustri, si distinguono in i. continentali e i. oceaniche. Le prime poggiano sulla <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/piattaforma/">piattaforma</a> continentale e sono legate per <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/struttura/">struttura</a> geologica al continente, dal quale si sono separate a causa di movimenti tettonici o per il sollevamento del livello del mare in seguito alla fusione dei ghiacciai quaternari (per es., la Gran Bretagna e le isole della <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/costa/">costa</a> dalmata). Le i. oceaniche non hanno alcuna relazione con il continente e la loro formazione è generalmente connessa all’attività vulcanica o a quella di organismi come coralli e madrepore. </p></div><div class="paywall term-paragraph2 Term_elTermParagraph__jPdF6 MuiBox-root css-0"><p class="MuiTypography-root MuiTypography-bodyL css-d8t48w"><style data-emotion="css uehu9e">.css-uehu9e{margin:0;font-style:italic;font-size:inherit;}</style><em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. coralline</em> Costruzioni emergenti dal mare dovute al lento depositarsi di sali calcarei a opera di madrepore. L’estensione può variare da poche decine di metri a parecchi chilometri. Sono tipiche dei mari caldi (Mar Rosso, Pacifico ecc.) e, se ampiamente sviluppate, possono collegarsi fra loro e dare luogo a estesi sbarramenti detti barriere coralline. <em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. di erosione</em> Particolare tipo di i. che si determinano quando un nucleo di rocce più resistenti è contornato da rocce più tenere. L’ondazione o l’erosione fluviale possono distruggere le seconde e rispettare le prime. Si chiamano così anche le i. formate dai materiali alluvionali nel <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/letto/">letto</a> dei fiumi a grande alveo, che erodono lateralmente i propri depositi alluvionali, lasciando inalterati quelli determinanti l’i., che così emerge sempre più distintamente. </p></div><div class="paywall term-paragraph3 Term_elTermParagraph__jPdF6 MuiBox-root css-0"><p class="MuiTypography-root MuiTypography-bodyL css-d8t48w"><em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. galleggianti</em> Isolotti costituiti da ammassi di vegetali palustri, contenenti talvolta <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/fango/">fango</a> e terriccio, che, staccatisi dal fondo delle depressioni lacustri nelle quali si sono formati, vengono a galla presentando così un fondo falso e pericoloso; sono tipiche delle regioni paludose di qualche estensione e delle torbiere in via di formazione. </p></div><div class="paywall term-paragraph4 Term_elTermParagraph__jPdF6 MuiBox-root css-0"><p class="MuiTypography-root MuiTypography-bodyL css-d8t48w"><em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. vulcaniche</em> Formazioni vulcaniche emergenti dal mare, spesso con coni regolari; alcune hanno durata precaria (per es. l’I. Ferdinandea, a S della <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/sicilia_res-51b7c2ab-973b-11e5-8844-00271042e8d9/">Sicilia</a>) o sono soggette a distruzioni e trasformazioni al rinnovarsi dei fenomeni eruttivi (<a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/santorino/">Santorino</a>); le più estese sono dovute a sovrapposizione e accumulo di grandi colate laviche, come quelle che formano in gran parte l’ossatura dell’Islanda. </p></div><div class="paywall term-paragraph5 Term_elTermParagraph__jPdF6 MuiBox-root css-0"> <h2 class="MuiTypography-root MuiTypography-leadP css-ua2ada"><span id="Anatomia" class="mw-headline">Anatomia</span></h2> <p class="MuiTypography-root MuiTypography-bodyL css-d8t48w"><em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. di Langerhans</em> Piccoli gruppi di cellule distribuiti in tutta la massa tessutale del pancreas. In esse risiede la funzione endocrina della ghiandola, cioè l’elaborazione dell’ormone noto con il nome di <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/insulina/">insulina</a>; nel pancreas dell’uomo ammontano a circa un milione e mezzo. </p></div><div class="paywall term-paragraph6 Term_elTermParagraph__jPdF6 MuiBox-root css-0"><p class="MuiTypography-root MuiTypography-bodyL css-d8t48w"><em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. di Reil</em> La porzione triangolare laterale dell’emisfero cerebrale dei Mammiferi Primati, che è ricoperta dal <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/lobo/">lobo</a> temporale ed è situata nel fondo della scissura di Silvio. Corrisponde all’<a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/area/">area</a> della corteccia che ricopre il corpo striato. Nel cervello umano si presenta generalmente più sviluppata nell’emisfero di sinistra che in quello di destra, ed è costituita da due lobuli – anteriore e posteriore – separati da un <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/solco/">solco</a>. </p></div><div class="paywall term-paragraph7 Term_elTermParagraph__jPdF6 MuiBox-root css-0"> <h2 class="MuiTypography-root MuiTypography-leadP css-ua2ada"><span id="Linguistica" class="mw-headline">Linguistica</span></h2> <p class="MuiTypography-root MuiTypography-bodyL css-d8t48w"><em class="MuiTypography-root MuiTypography-italic css-uehu9e">I. linguistiche</em> Aree più o meno ristrette nelle quali la lingua si mantiene senza espandersi, o perché ha trovato ostacoli nei fattori geografici regionali, o perché si è determinato il distacco e <a style="vertical-align:baseline;font-size:inherit;text-decoration:underline;color:#93282C" href="/enciclopedia/isolamento/">isolamento</a> di una parte delle popolazioni parlanti una certa lingua dalla restante area nella quale la medesima lingua è parlata. Le i. linguistiche si trovano di solito alle propaggini dei continenti o in vallate alpine isolate. </p></div><div class="paywall term-paragraph8 Term_elTermParagraph__jPdF6 MuiBox-root css-0"> <h2 class="MuiTypography-root MuiTypography-leadP css-ua2ada"><span id="Tecnica" class="mw-headline">Tecnica</span></h2> <p class="MuiTypography-root MuiTypography-bodyL css-d8t48w">Nella costruzione navale mercantile, le sovrastrutture separate fra loro, come casseri, tughe ecc. Nella costruzione navale militare, speciali sovrastrutture disposte sul ponte di volo delle navi portaerei, generalmente di lato, in modo da non ostacolare le manovre degli aerei. </p></div><div class="paywall term-paragraph9 Term_elTermParagraph__jPdF6 MuiBox-root css-0"> <table summary="Tabella sinottica che riassume i principali dati del soggetto" class="sinottico"></table> </div><style data-emotion="css fm1z82">.css-fm1z82{width:100%;margin-left:auto;box-sizing:border-box;margin-right:auto;display:block;padding-left:0.125rem;padding-right:0.125rem;padding-left:0!important;padding-right:0!important;}@media (min-width:576px){.css-fm1z82{padding-left:0.1875rem;padding-right:0.1875rem;}}@media (min-width:0px){.css-fm1z82{padding-left:1.6875rem;padding-right:1.6875rem;}}@media (min-width:1921px){.css-fm1z82{padding-left:4rem;padding-right:4rem;}}</style><div class="MuiContainer-root css-fm1z82"><style data-emotion="css 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type="application/json">{"props":{"pageProps":{"data":{"published_images":[],"titolo4url":"isola","voc_matches":[{"query":"isola","url":"https://www.treccani.it/vocabolario/isola","section":"vocabolario","title":"ìṡola","abstract":" isola \n \nìṡola s. f. [dal lat. insŭla (che aveva anche il sign. 3), voce di origine incerta; isola è forma semidotta, di fronte alla forma ereditaria ischia che compare come toponimo]. – 1. a. Porzione di terraferma completamente circondata ...","opera":""},{"query":"isola-ecologica_(Neologismi)","url":"https://www.treccani.it/vocabolario/isola-ecologica_(Neologismi)","section":"vocabolario","title":"isola ecologica","abstract":" isola ecologica \n \nloc. s.le f. Area attrezzata per la raccolta differenziata di rifiuti di ogni tipo. ◆ A decorrere dal 1° gennaio 2000 i comuni avviano, con forme adeguate, l’attivazione di servizi di raccolta differenziata dei rifiuti: ...","opera":"Neologismi"}],"menu":"\u003cdiv aria-labelledby=\"mw-toc-heading\" class=\"widget-bg toc\" id=\"toc\" role=\"navigation\"\u003e\n\u003cul\u003e\n\u003cli class=\"toclevel-1 tocsection-1\"\u003e\u003ca href=\"#Geografia\"\u003e\u003cspan class=\"tocnumber\"\u003e1\u003c/span\u003e \u003cspan class=\"toctext\"\u003eGeografia\u003c/span\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli class=\"toclevel-1 tocsection-2\"\u003e\u003ca href=\"#Anatomia\"\u003e\u003cspan class=\"tocnumber\"\u003e2\u003c/span\u003e \u003cspan class=\"toctext\"\u003eAnatomia\u003c/span\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli class=\"toclevel-1 tocsection-3\"\u003e\u003ca href=\"#Linguistica\"\u003e\u003cspan class=\"tocnumber\"\u003e3\u003c/span\u003e \u003cspan class=\"toctext\"\u003eLinguistica\u003c/span\u003e\u003c/a\u003e\u003c/li\u003e\n\u003cli class=\"toclevel-1 tocsection-4\"\u003e\u003ca href=\"#Tecnica\"\u003e\u003cspan class=\"tocnumber\"\u003e4\u003c/span\u003e \u003cspan class=\"toctext\"\u003eTecnica\u003c/span\u003e\u003c/a\u003e\u003c/li\u003e\n\u003c/ul\u003e\n\u003c/div\u003e\u003c/li\u003e\u003c/ul\u003e","content":"\u003ch2 class=\"sc-paragraph\"\u003e\u003cspan class=\"mw-headline\" id=\"Geografia\"\u003eGeografia\u003c/span\u003e\u003c/h2\u003e\n\u003cp\u003ePorzione di terraferma completamente circondata dall’acqua e situata in un \u003ca href=\"/enciclopedia/oceano\"\u003eoceano\u003c/a\u003e, \u003ca href=\"/enciclopedia/mare\"\u003emare\u003c/a\u003e, \u003ca href=\"/enciclopedia/lago\"\u003elago\u003c/a\u003e, \u003ca href=\"/enciclopedia/laguna\"\u003elaguna\u003c/a\u003e o fiume; l’origine delle i. può essere dovuta a movimenti della \u003ca href=\"/enciclopedia/crosta\"\u003ecrosta\u003c/a\u003e terrestre, \u003ca href=\"/enciclopedia/erosione\"\u003eerosione\u003c/a\u003e, \u003ca href=\"/enciclopedia/vulcanismo\"\u003evulcanismo\u003c/a\u003e, deposizione di materiali sedimentari, formazione madreporica.\n\u003c/p\u003e\u003cp\u003eL’estensione complessiva delle i. supera i 10 milioni di km\u003csup\u003e2\u003c/sup\u003e. Le i. marine più importanti e numerose, rispetto a quelle fluviali e lacustri, si distinguono in i. continentali e i. oceaniche. Le prime poggiano sulla \u003ca href=\"/enciclopedia/piattaforma\"\u003epiattaforma\u003c/a\u003e continentale e sono legate per \u003ca href=\"/enciclopedia/struttura\"\u003estruttura\u003c/a\u003e geologica al continente, dal quale si sono separate a causa di movimenti tettonici o per il sollevamento del livello del mare in seguito alla fusione dei ghiacciai quaternari (per es., la Gran Bretagna e le isole della \u003ca href=\"/enciclopedia/costa\"\u003ecosta\u003c/a\u003e dalmata). Le i. oceaniche non hanno alcuna relazione con il continente e la loro formazione è generalmente connessa all’attività vulcanica o a quella di organismi come coralli e madrepore.\n\u003c/p\u003e\u003cp\u003e\u003ci\u003eI. coralline\u003c/i\u003e Costruzioni emergenti dal mare dovute al lento depositarsi di sali calcarei a opera di madrepore. L’estensione può variare da poche decine di metri a parecchi chilometri. Sono tipiche dei mari caldi (Mar Rosso, Pacifico ecc.) e, se ampiamente sviluppate, possono collegarsi fra loro e dare luogo a estesi sbarramenti detti barriere coralline. \u003ci\u003eI. di erosione\u003c/i\u003e Particolare tipo di i. che si determinano quando un nucleo di rocce più resistenti è contornato da rocce più tenere. L’ondazione o l’erosione fluviale possono distruggere le seconde e rispettare le prime. Si chiamano così anche le i. formate dai materiali alluvionali nel \u003ca href=\"/enciclopedia/letto\"\u003eletto\u003c/a\u003e dei fiumi a grande alveo, che erodono lateralmente i propri depositi alluvionali, lasciando inalterati quelli determinanti l’i., che così emerge sempre più distintamente.\n\u003c/p\u003e\u003cp\u003e\u003ci\u003eI. galleggianti\u003c/i\u003e Isolotti costituiti da ammassi di vegetali palustri, contenenti talvolta \u003ca href=\"/enciclopedia/fango\"\u003efango\u003c/a\u003e e terriccio, che, staccatisi dal fondo delle depressioni lacustri nelle quali si sono formati, vengono a galla presentando così un fondo falso e pericoloso; sono tipiche delle regioni paludose di qualche estensione e delle torbiere in via di formazione.\n\u003c/p\u003e\u003cp\u003e\u003ci\u003eI. vulcaniche\u003c/i\u003e Formazioni vulcaniche emergenti dal mare, spesso con coni regolari; alcune hanno durata precaria (per es. l’I. Ferdinandea, a S della \u003ca href=\"/enciclopedia/sicilia_res-51b7c2ab-973b-11e5-8844-00271042e8d9\"\u003eSicilia\u003c/a\u003e) o sono soggette a distruzioni e trasformazioni al rinnovarsi dei fenomeni eruttivi (\u003ca href=\"/enciclopedia/santorino\"\u003eSantorino\u003c/a\u003e); le più estese sono dovute a sovrapposizione e accumulo di grandi colate laviche, come quelle che formano in gran parte l’ossatura dell’Islanda.\n\u003c/p\u003e\n\u003ch2 class=\"sc-paragraph\"\u003e\u003cspan class=\"mw-headline\" id=\"Anatomia\"\u003eAnatomia\u003c/span\u003e\u003c/h2\u003e\n\u003cp\u003e\u003ci\u003eI. di Langerhans\u003c/i\u003e Piccoli gruppi di cellule distribuiti in tutta la massa tessutale del pancreas. In esse risiede la funzione endocrina della ghiandola, cioè l’elaborazione dell’ormone noto con il nome di \u003ca href=\"/enciclopedia/insulina\"\u003einsulina\u003c/a\u003e; nel pancreas dell’uomo ammontano a circa un milione e mezzo.\n\u003c/p\u003e\u003cp\u003e\u003ci\u003eI. di Reil\u003c/i\u003e La porzione triangolare laterale dell’emisfero cerebrale dei Mammiferi Primati, che è ricoperta dal \u003ca href=\"/enciclopedia/lobo\"\u003elobo\u003c/a\u003e temporale ed è situata nel fondo della scissura di Silvio. Corrisponde all’\u003ca href=\"/enciclopedia/area\"\u003earea\u003c/a\u003e della corteccia che ricopre il corpo striato. Nel cervello umano si presenta generalmente più sviluppata nell’emisfero di sinistra che in quello di destra, ed è costituita da due lobuli – anteriore e posteriore – separati da un \u003ca href=\"/enciclopedia/solco\"\u003esolco\u003c/a\u003e.\n\u003c/p\u003e\n\u003ch2 class=\"sc-paragraph\"\u003e\u003cspan class=\"mw-headline\" id=\"Linguistica\"\u003eLinguistica\u003c/span\u003e\u003c/h2\u003e\n\u003cp\u003e\u003ci\u003eI. linguistiche\u003c/i\u003e Aree più o meno ristrette nelle quali la lingua si mantiene senza espandersi, o perché ha trovato ostacoli nei fattori geografici regionali, o perché si è determinato il distacco e \u003ca href=\"/enciclopedia/isolamento\"\u003eisolamento\u003c/a\u003e di una parte delle popolazioni parlanti una certa lingua dalla restante area nella quale la medesima lingua è parlata. Le i. linguistiche si trovano di solito alle propaggini dei continenti o in vallate alpine isolate.\n\u003c/p\u003e\n\u003ch2 class=\"sc-paragraph\"\u003e\u003cspan class=\"mw-headline\" id=\"Tecnica\"\u003eTecnica\u003c/span\u003e\u003c/h2\u003e\n\u003cp\u003eNella costruzione navale mercantile, le sovrastrutture separate fra loro, come casseri, tughe ecc. Nella costruzione navale militare, speciali sovrastrutture disposte sul ponte di volo delle navi portaerei, generalmente di lato, in modo da non ostacolare le manovre degli aerei.\n\u003c/p\u003e\n\u003ctable class=\"sinottico\" style=\"\" summary=\"Tabella sinottica che riassume i principali dati del soggetto\"\u003e\u003c/table\u003e\u003c!-- DEBUG --\u003e\n \u003c!-- 99184876-ba8b-11df-9cd8-d5ce3506d72e --\u003e\n \u003c!-- /sites/default/BancaDati/Enciclopedia_online/I-J/npt-ol_i_002277_I0022770.xml --\u003e","categories":[{"cat3_label":"industria automobilistica ferroviaria e navale","cat2":"industria","cat3":"industria_automobilistica_ferroviaria_e_navale","cat1":"tecnologia_e_scienze_applicate","section":"enciclopedia","cat1_label":"tecnologia e scienze applicate","url":"https://www.treccani.it/enciclopedia/tecnologia_e_scienze_applicate/industria/industria_automobilistica_ferroviaria_e_navale","cat2_label":"industria"},{"cat3_label":"geografia fisica","cat2":"geografia","cat3":"geografia_fisica","cat1":"scienze_naturali_e_matematiche","section":"enciclopedia","cat1_label":"scienze naturali e matematiche","url":"https://www.treccani.it/enciclopedia/scienze_naturali_e_matematiche/geografia/geografia_fisica","cat2_label":"geografia"},{"cat3_label":"anatomia","cat2":"medicina","cat3":"anatomia","cat1":"scienze_naturali_e_matematiche","section":"enciclopedia","cat1_label":"scienze naturali e matematiche","url":"https://www.treccani.it/enciclopedia/scienze_naturali_e_matematiche/medicina/anatomia","cat2_label":"medicina"},{"cat3_label":"linguistica generale","cat2":"lingua","cat3":"linguistica_generale","cat1":"arte_lingua_e_letteratura","section":"enciclopedia","cat1_label":"arte lingua e letteratura","url":"https://www.treccani.it/enciclopedia/arte_lingua_e_letteratura/lingua/linguistica_generale","cat2_label":"lingua"}],"author":"","opera":"Enciclopedie on line","meta":{"html":{"title":"isola nell'Enciclopedia Treccani","description":"Geografia\nPorzione di terraferma completamente circondata dall’acqua e situata in un oceano, mare, lago, laguna o fiume; l’origine delle i. può essere dovuta a movimenti della crosta terrestre, erosione, vulcanismo, deposizione di materiali sedimentari, formazione madreporica.\nL’estensione complessiva delle i. supera i 10 milioni di km2. Le i. marine più importanti e numerose, rispetto a quelle fluviali e lacustri, si distinguono in i. continentali e i. oceaniche. Le prime poggiano sulla piattaf"},"twitter":{"card":"summary","site":"@Treccani","url":"https://www.treccani.it/enciclopedia/isola","title":"isola","description":"Geografia\nPorzione di terraferma completamente circondata dall’acqua e situata in un oceano, mare, lago, laguna o fiume; l’origine delle i. può essere dovuta a movimenti della crosta terrestre, erosione, vulcanismo, deposizione di materiali sedimentari, formazione madreporica.\nL’estensione complessiva delle i. supera i 10 milioni di km2. Le i. marine più importanti e numerose, rispetto a quelle fluviali e lacustri, si distinguono in i. continentali e i. oceaniche. Le prime poggiano sulla piattaf","image":"https://images.treccani.it/enc/media/images/social-120x120.jpg"},"facebook":{"url":"https://www.treccani.it/enciclopedia/isola","type":"website","title":"isola","description":"Geografia\nPorzione di terraferma completamente circondata dall’acqua e situata in un oceano, mare, lago, laguna o fiume; l’origine delle i. può essere dovuta a movimenti della crosta terrestre, erosione, vulcanismo, deposizione di materiali sedimentari, formazione madreporica.\nL’estensione complessiva delle i. supera i 10 milioni di km2. Le i. marine più importanti e numerose, rispetto a quelle fluviali e lacustri, si distinguono in i. continentali e i. oceaniche. Le prime poggiano sulla piattaf","image":"https://images.treccani.it/enc/media/images/social=200x200.jpg"}},"tags":[{"query":"piattaforma-continentale","url":"https://www.treccani.it/enciclopedia/tag/piattaforma-continentale","section":"enciclopedia","label":"PIATTAFORMA CONTINENTALE"},{"query":"movimenti-tettonici","url":"https://www.treccani.it/enciclopedia/tag/movimenti-tettonici","section":"enciclopedia","label":"MOVIMENTI TETTONICI"},{"query":"emisfero-cerebrale","url":"https://www.treccani.it/enciclopedia/tag/emisfero-cerebrale","section":"enciclopedia","label":"EMISFERO CEREBRALE"},{"query":"barriere-coralline","url":"https://www.treccani.it/enciclopedia/tag/barriere-coralline","section":"enciclopedia","label":"BARRIERE CORALLINE"},{"query":"crosta-terrestre","url":"https://www.treccani.it/enciclopedia/tag/crosta-terrestre","section":"enciclopedia","label":"CROSTA TERRESTRE"}],"related":[{"query":"mare","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/it/thumb/d/d6/Parga's_sea_by_Claudio_Cuomo.jpeg/30px-Parga's_sea_by_Claudio_Cuomo.jpeg","url":"https://www.treccani.it/enciclopedia/mare","abstract":"Massa d’acqua che circonda la terraferma e ricopre gran parte della superficie terrestre. In senso stretto, si indicano con il termine oceano gli spazi acquei più vasti e si chiamano mare distese acquee minori che, dipendendo da uno o più oceani, si differenziano da questi per caratteristiche proprie ...","title":"mare","treccani_id":"bb3f280c-e02e-11df-9ef0-d5ce3506d72e"},{"query":"nave","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Lazio_02-06-2006_cagliari_(4).jpg/30px-Lazio_02-06-2006_cagliari_(4).jpg","url":"https://www.treccani.it/enciclopedia/nave","abstract":"Costruzione di una certa grandezza e capacità (stazza lorda superiore a 50 t; per stazze inferiori si parla di imbarcazione), adibita al trasporto per acqua di persone, merci, o anche ad azioni belliche. In senso stretto e più comune, sono nave quelle che galleggiano sull’acqua, in senso più ampio, anche ...","title":"nave","treccani_id":"5ce4a0bc-e198-11df-9ef0-d5ce3506d72e"},{"query":"cargo","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/8/86/Mindelo_cargos.jpg/30px-Mindelo_cargos.jpg","url":"https://www.treccani.it/enciclopedia/cargo","abstract":"trasportI\nNel linguaggio internazionale della marina mercantile, cargo-boat e cargo-liner, navi da carico rispettivamente adibite a viaggi liberi o a viaggi su rotte prestabilite e con orari: il cargo-liner generalmente è più veloce del cargo-boat e spesso ha anche qualche sistemazione per passeggeri ...","title":"cargo","treccani_id":"d95cd9c7-9629-11de-baff-0016357eee51"},{"query":"oceano","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/8/82/World_ocean_map.gif/30px-World_ocean_map.gif","url":"https://www.treccani.it/enciclopedia/oceano","abstract":"Vasta distesa acquea che circonda i continenti. I tre principali bacini oceanici (Pacifico, Atlantico, Indiano), comprensivi dei bacini minori e dei mari adiacenti, coprono un’area di circa 361 milioni di km2, occupando circa il 71% della superficie terrestre.\n1. Morfologia dei bacini oceanici\nLa distribuzione ...","title":"oceano","treccani_id":"41d336d3-f866-11e2-97d5-00271042e8d9"},{"query":"laguna","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Lagoon-of-venice-landsat-1.jpg/30px-Lagoon-of-venice-landsat-1.jpg","url":"https://www.treccani.it/enciclopedia/laguna","abstract":"Bacino acqueo costiero, separato dal mare da un cordone litorale (barriera costiera) interrotto da bocche di accesso (bocche di marea o lagunari), e nel quale emergono spesso formazioni insulari. \n● Le laguna costituiscono ambienti sedimentari di acqua poco profonda, estremamente variabili in relazione ...","title":"laguna","treccani_id":"391a31c6-cf9c-11df-8719-d5ce3506d72e"},{"query":"dalmazia","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/it/thumb/f/f2/Dalmazia.jpg/30px-Dalmazia.jpg","url":"https://www.treccani.it/enciclopedia/dalmazia","abstract":"(serbocr. Dalmacija) Regione della Penisola Balcanica (11.750 km2 con 900.000 ab. circa), largamente aperta (1570 km di linea costiera) sull’Adriatico. Politicamente è divisa tra Croazia (per la massima parte), Bosnia-Erzegovina e Montenegro, pur rappresentando un’entità geografica ben definita, limitata ...","title":"Dalmazia","treccani_id":"9cae1e51-a820-11de-baff-0016357eee51"},{"query":"islanda","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/6/66/Europe-Iceland.svg/30px-Europe-Iceland.svg.png","url":"https://www.treccani.it/enciclopedia/islanda","abstract":"Stato insulare nell’Atlantico settentrionale, tra 63°24′ lat. N e il Circolo Polare, e fra 13°30′ e 24°25′ long. O. Dista oltre 800 km dalle coste settentrionali della Scozia e un migliaio di km da quelle norvegesi; a O il Canale di Danimarca, largo quasi 300 km, la separa dalla Groenlandia. \n1. Caratteristiche ...","title":"Islanda","treccani_id":"ddd3b891-ba89-11df-9cd8-d5ce3506d72e"},{"query":"james-cook","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/7/76/Captainjamescookportrait.jpg/30px-Captainjamescookportrait.jpg","url":"https://www.treccani.it/enciclopedia/james-cook","abstract":"(noto come capitano Cook, James). - Navigatore inglese (Marton, Yorkshire, 1728 - is. Sandwich 1779). Impegnato in varie spedizioni per la Società Reale, scoprì in Nuova Zelanda (1770) lo stretto che porta il suo nome. Esplorò le coste orientali dell'Australia e navigò attraverso il Pacifico, scoprendo ...","title":"James Cook","treccani_id":"884e9731-86d5-11dc-9a1b-0016357eee51"},{"query":"leif-eriksson","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/d/d3/LeifErikson1968stamp.jpg/30px-LeifErikson1968stamp.jpg","url":"https://www.treccani.it/enciclopedia/leif-eriksson","abstract":"‹lèiv éerikssoon› (ant. islandese Leïfr Eiriksson). - Navigatore normanno (sec. 10º-11º), figlio di Erik il Rosso; partito (1000 circa) per la Groenlandia, dirottò con la propria nave a SO dell'isola raggiungendo una terra (chiamata da lui Vinland) sulla costa del continente americano, non bene identificata ...","title":"Leif Eriksson","treccani_id":"5f94093b-86d7-11dc-9a1b-0016357eee51"},{"query":"jean-baptiste-etienne-auguste-charcot","section":"enciclopedia","opera":"Enciclopedie on line","image":"http://upload.wikimedia.org/wikipedia/commons/thumb/2/2d/Jean-Baptiste_Charcot.jpg/30px-Jean-Baptiste_Charcot.jpg","url":"https://www.treccani.it/enciclopedia/jean-baptiste-etienne-auguste-charcot","abstract":"Charcot ‹šarkó›, Jean-Baptiste-Étienne-Auguste. - Esploratore francese (Neuilly 1867 - Islanda 1936), figlio di Jean-Martin. Nell'Antartide (1903-o5 e 1908-10), scoprì l'isola chiamata poi Charcot e costruì la carta della terra di Graham. Con la nave Pourquoi pas?, che aveva comandata nella spedizione ...","title":"Jean-Baptiste-\u0026#xC9;tienne-Auguste Charcot","treccani_id":"2a8f4302-86d5-11dc-9a1b-0016357eee51"}],"insights":[{"query":"isole_(Enciclopedia-dei-ragazzi)","url":"https://www.treccani.it/enciclopedia/isole_(Enciclopedia-dei-ragazzi)","title":"isole","section":"enciclopedia","abstract":"Katia Di Tommaso\n\nTerre separate\nDa quelle sotto costa a quelle sperdute in mezzo agli oceani, da quelle minuscole a quelle grandi molte volte l'Italia, sono centinaia di migliaia le isole nei mari, fiumi e laghi della Terra. Affascinante o terribile, attrattiva per turisti o rifugio di genti 'primitive', ...","opera":"Enciclopedia dei ragazzi (2005)","year":"2005"},{"query":"isola_(Dizionario-delle-Scienze-Fisiche)","url":"https://www.treccani.it/enciclopedia/isola_(Dizionario-delle-Scienze-Fisiche)","title":"isola","section":"enciclopedia","abstract":"ìsola [Der. del lat. insula] [GFS] Nella geografia fisica e nella geologia, porzione di terraferma completamente circondata dall'acqua in un oceano, mare, lago, laguna o fiume; per le grandi i. negli oceani, la distinzione tra i. e continente è piuttosto convenzionale e determinata da vari fattori, ...","opera":"Dizionario delle Scienze Fisiche (1996)","year":"1996"},{"query":"isola_(Enciclopedia-Italiana)","url":"https://www.treccani.it/enciclopedia/isola_(Enciclopedia-Italiana)","title":"ISOLA","section":"enciclopedia","abstract":"(lat. insula, fr. île; sp. isla; ted. 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