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class="mw-page-title-main">Boring (earth)</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 16 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-16" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">16 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D8%AD%D9%81%D8%B1_(%D8%A7%D9%84%D8%A3%D8%B1%D8%B6)" title="حفر (الأرض) – Arabic" lang="ar" hreflang="ar" data-title="حفر (الأرض)" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%91%D1%83%D1%80%D1%8D%D0%BD%D0%BD%D0%B5" title="Бурэнне – Belarusian" lang="be" hreflang="be" data-title="Бурэнне" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Bohrung_(Geologie)" title="Bohrung (Geologie) – German" lang="de" hreflang="de" data-title="Bohrung (Geologie)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D8%AD%D9%81%D8%A7%D8%B1%DB%8C_(%D8%B2%D9%85%DB%8C%D9%86)" title="حفاری (زمین) – Persian" lang="fa" hreflang="fa" data-title="حفاری (زمین)" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Forage" title="Forage – French" lang="fr" hreflang="fr" data-title="Forage" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EC%8B%9C%EC%B6%94_(%ED%86%A0%EA%B3%B5)" title="시추 (토공) – Korean" lang="ko" hreflang="ko" data-title="시추 (토공)" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hy mw-list-item"><a href="https://hy.wikipedia.org/wiki/%D5%80%D5%B8%D6%80%D5%A1%D5%BF%D5%A1%D5%BA%D5%A1%D5%B5%D5%A9%D5%A5%D6%81%D5%B4%D5%A1%D5%B6_%D5%A1%D5%B7%D5%AD%D5%A1%D5%BF%D5%A1%D5%B6%D6%84%D5%B6%D5%A5%D6%80" title="Հորատապայթեցման աշխատանքներ – Armenian" lang="hy" hreflang="hy" data-title="Հորատապայթեցման աշխատանքներ" data-language-autonym="Հայերեն" data-language-local-name="Armenian" class="interlanguage-link-target"><span>Հայերեն</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%B5%E0%A5%87%E0%A4%A7%E0%A4%A8_(%E0%A4%AA%E0%A5%83%E0%A4%A5%E0%A5%8D%E0%A4%B5%E0%A5%80)" title="वेधन (पृथ्वी) – Hindi" lang="hi" hreflang="hi" data-title="वेधन (पृथ्वी)" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/%E1%83%91%E1%83%A3%E1%83%A0%E1%83%A6%E1%83%95%E1%83%90" title="ბურღვა – Georgian" lang="ka" hreflang="ka" data-title="ბურღვა" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-kk mw-list-item"><a href="https://kk.wikipedia.org/wiki/%D0%91%D2%B1%D1%80%D2%93%D1%8B%D0%BB%D0%B0%D1%83" title="Бұрғылау – Kazakh" lang="kk" hreflang="kk" data-title="Бұрғылау" data-language-autonym="Қазақша" data-language-local-name="Kazakh" class="interlanguage-link-target"><span>Қазақша</span></a></li><li class="interlanguage-link interwiki-lv mw-list-item"><a href="https://lv.wikipedia.org/wiki/Zemes_urb%C5%A1ana" title="Zemes urbšana – Latvian" lang="lv" hreflang="lv" data-title="Zemes urbšana" data-language-autonym="Latviešu" data-language-local-name="Latvian" class="interlanguage-link-target"><span>Latviešu</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E3%83%9C%E3%83%BC%E3%83%AA%E3%83%B3%E3%82%B0" title="ボーリング – Japanese" lang="ja" hreflang="ja" data-title="ボーリング" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl 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.ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Boring_(earth)" title="Special:EditPage/Boring (earth)">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Boring%22+earth">"Boring" earth</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Boring%22+earth+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Boring%22+earth&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Boring%22+earth+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Boring%22+earth">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Boring%22+earth&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">November 2017</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p><b>Boring</b> is <a href="/wiki/Drilling" title="Drilling">drilling</a> a hole, tunnel, or <a href="/wiki/Well" title="Well">well</a> in the Earth. It is used for various applications in <a href="/wiki/Geology" title="Geology">geology</a>, <a href="/wiki/Agriculture" title="Agriculture">agriculture</a>, <a href="/wiki/Hydrology" title="Hydrology">hydrology</a>, <a href="/wiki/Civil_engineering" title="Civil engineering">civil engineering</a>, and <a href="/wiki/Mineral_exploration" class="mw-redirect" title="Mineral exploration">mineral exploration</a>. Today, most Earth drilling serves one of the following purposes: </p> <ul><li>return samples of the <a href="/wiki/Soil" title="Soil">soil</a> and/or <a href="/wiki/Rock_(geology)" title="Rock (geology)">rock</a> through which the drill passes</li> <li>access rocks from which material can be extracted</li> <li>access rocks which can then be measured</li> <li>provide access to rock for purposes of providing engineering support</li></ul> <p>Unlike drilling in other materials where the aim is to create a hole for some purpose, often the case of drilling or coring is to get an understanding of the ground/<a href="/wiki/Lithology" title="Lithology">lithology</a>. This may be done for <a href="/wiki/Prospecting" title="Prospecting">prospecting</a> to identify and quantify an ore body for mining, or to determining the type of foundations needed for a building or raised structure, or for underground structures, including tunnels and deep basements where an understanding of the ground is vital to determining how to excavate and the support philosophy. Drilling is also used in vertical and inclined shaft construction. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Boring_Machine_1911_Illustration.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/6/6c/Boring_Machine_1911_Illustration.jpg" decoding="async" width="161" height="257" class="mw-file-element" data-file-width="161" data-file-height="257" /></a><figcaption>A boring machine illustration from the <a href="/wiki/Encyclop%C3%A6dia_Britannica_Eleventh_Edition" title="Encyclopædia Britannica Eleventh Edition">1911 Encyclopædia Britannica</a>.</figcaption></figure> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Boring_machine.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Boring_machine.jpg/220px-Boring_machine.jpg" decoding="async" width="220" height="293" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Boring_machine.jpg/330px-Boring_machine.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Boring_machine.jpg/440px-Boring_machine.jpg 2x" data-file-width="1536" data-file-height="2048" /></a><figcaption><a href="/wiki/Mud_log" class="mw-redirect" title="Mud log">Mud log</a> in process, a common way to study the lithology when drilling wells.</figcaption></figure> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Borehole drilling has a long history. <a href="/wiki/Han_dynasty" title="Han dynasty">Han dynasty</a> China (202 BC – 220 AD) used deep borehole drilling for mining and other projects. Chinese borehole sites could reach as deep as 600 m (2,000 ft).<sup id="cite_ref-loewe_1968_194_1-0" class="reference"><a href="#cite_note-loewe_1968_194-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Methods">Methods</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=2" title="Edit section: Methods"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>When drilling in stone, one must pay particular attention to the type of material. There are three different classifications of drill bits used for drilling into stone: soft, medium, and hard. Soft formation rock bits are used in unconsolidated sands, clays, and soft limestones, etc. Medium formation bits are used in <a href="/wiki/Dolomites" title="Dolomites">dolomites</a>, <a href="/wiki/Limestones" class="mw-redirect" title="Limestones">limestones</a>, and <a href="/wiki/Shale" title="Shale">shale</a>, while hard formation bits are used in hard shale, <a href="/wiki/Mudstones" class="mw-redirect" title="Mudstones">mudstones</a>, <a href="/wiki/Granite" title="Granite">granite</a>, <a href="/wiki/Limestones" class="mw-redirect" title="Limestones">limestones</a> and other hard and/or abrasive formations. </p><p>Soft ground drilling can be undertaken using a <a href="/w/index.php?title=Rotary_auger&action=edit&redlink=1" class="new" title="Rotary auger (page does not exist)">rotary auger</a> or <a href="/w/index.php?title=Wash_boring&action=edit&redlink=1" class="new" title="Wash boring (page does not exist)">wash boring</a> techniques, while rock drilling often use methods such as <a href="/w/index.php?title=NMLC&action=edit&redlink=1" class="new" title="NMLC (page does not exist)">NMLC</a> which allow for recovery of a core of material which can be examined to determine the strength, degree of weathering, understanding of any how intact the rock is (<a href="/wiki/RQD" class="mw-redirect" title="RQD">RQD</a>) and identify any <a href="/wiki/Discontinuity_(geotechnical_engineering)" title="Discontinuity (geotechnical engineering)">discontinuities</a> or other planes of weakness. </p><p>Testing of the material in <a href="/wiki/Borehole" title="Borehole">boreholes</a> is also possible. In soft ground the <a href="/wiki/Standard_penetration_test" title="Standard penetration test">standard penetration test</a> can be used to determine the strength of the material. In rock in-situ stress testing using <a href="/wiki/Hydrofracturing" class="mw-redirect" title="Hydrofracturing">hydrofracturing</a> or <a href="/w/index.php?title=Overcoring&action=edit&redlink=1" class="new" title="Overcoring (page does not exist)">overcoring</a>, <a href="/w/index.php?title=Acoustic_Televiewer&action=edit&redlink=1" class="new" title="Acoustic Televiewer (page does not exist)">Acoustic Televiewer</a> can be used to map discontinuities to determine their orientation. It is also possible once a borehole is complete to measure the <a href="/wiki/Permeability_(earth_sciences)" class="mw-redirect" title="Permeability (earth sciences)">permeability</a>. Samples of water and material are also taken for examination and lab testing. </p> <div class="mw-heading mw-heading2"><h2 id="Superdeep_Borehole">Superdeep Borehole</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=3" title="Edit section: Superdeep Borehole"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>In 1961 the United States began <a href="/wiki/Project_Mohole" title="Project Mohole">Project Mohole</a>, an ambitious attempt to drill through the Earth's <a href="/wiki/Crust_(geology)" title="Crust (geology)">crust</a> into the <a href="/wiki/Mohorovicic_discontinuity" class="mw-redirect" title="Mohorovicic discontinuity">Mohorovičić discontinuity</a>. The project was discontinued due to high cost. </p><p>The <a href="/wiki/Kola_Superdeep_Borehole" title="Kola Superdeep Borehole">Kola Superdeep Borehole</a> was a similar project of the <a href="/wiki/USSR" class="mw-redirect" title="USSR">USSR</a> in the 1970s and early 1980s the <a href="/wiki/USSR" class="mw-redirect" title="USSR">USSR</a> attempted to drill a hole through the <a href="/wiki/Crust_(geology)" title="Crust (geology)">crust</a>, to sample the Mohorovičić discontinuity. The deepest hole ever drilled failed not because of lack of money or time, but because of <a href="/wiki/Petrophysics" title="Petrophysics">rock physics</a> at depth. At approximately 12,000 metres depth, rock begins to act more like a <a href="/wiki/Plasticity_(physics)" title="Plasticity (physics)">plastic</a> solid than a rigid solid. Rock temperatures of several hundred degrees <a href="/wiki/Celsius" title="Celsius">Celsius</a>, required that the <a href="/wiki/Drilling_fluid" title="Drilling fluid">drilling fluid</a> be <a href="/wiki/Refrigeration" title="Refrigeration">refrigerated</a> before being sent to the cutting face of the drill. As the drill bits burnt out and were removed for replacement, the hole simply flowed closed, and the rock had to be re-drilled. The hole was scrapped. </p><p>Further attempts are planned by <a href="/wiki/United_States" title="United States">American</a> consortia and further <a href="/wiki/Russia" title="Russia">Russian</a> attempts in <a href="/wiki/Finland" title="Finland">Finland</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Ice_boring">Ice boring</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=4" title="Edit section: Ice boring"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Ice_cores" class="mw-redirect" title="Ice cores">Ice cores</a> are drilled by hollow bits, in much the same way that sediment cores are drilled. When all that is needed is the hole, hot water drill technology may be used to melt holes in ice or snow for both Arctic and Antarctic research purposes. Equipment for such a method is also lightweight when drilling deep holes, compared to traditional drilling equipment. Hot water drilling has been used successfully in the <a href="/wiki/IceCube_Neutrino_Detector" class="mw-redirect" title="IceCube Neutrino Detector">IceCube Neutrino Detector</a> and <a href="/wiki/Antarctic_Muon_And_Neutrino_Detector_Array" title="Antarctic Muon And Neutrino Detector Array">Antarctic Muon And Neutrino Detector Array</a> projects to drill as deep as 2,450 meters. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=5" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Directional_boring" title="Directional boring">Directional boring</a></li> <li><a href="/wiki/Drifter_(drill)" class="mw-redirect" title="Drifter (drill)">Drifter (drill)</a></li> <li><a href="/wiki/Oil_well" title="Oil well">Oil well</a></li> <li><a href="/wiki/Standard_penetration_test" title="Standard penetration test">Standard penetration test</a></li> <li><a href="/wiki/Tunnel_boring_machine" title="Tunnel boring machine">Tunnel boring machine</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=6" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-loewe_1968_194-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-loewe_1968_194_1-0">^</a></b></span> <span class="reference-text">* Loewe, Michael. (1968). <i>Everyday Life in Early Imperial China during the Han Period 202 BC–AD 220</i>. London: B.T. Batsford Ltd.; New York: G.P. Putnam's Sons, p. 194.</span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Boring_(earth)&action=edit&section=7" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://archive.today/20130213085617/http://weppi.gtk.fi/projects/o_k_deepdrilling">Outokumpu Deep Drilling</a></li> <li><a rel="nofollow" class="external text" href="https://books.google.com/books?id=fScDAAAAMBAJ&dq=Idaho+Maryland+cylindrical+drill&pg=PA104">John Branner Newsom's boring machine</a></li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Boring_(earth)&oldid=1255619830">https://en.wikipedia.org/w/index.php?title=Boring_(earth)&oldid=1255619830</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:Chinese_inventions" title="Category:Chinese inventions">Chinese inventions</a></li><li><a href="/wiki/Category:Drilling_technology" title="Category:Drilling technology">Drilling technology</a></li><li><a href="/wiki/Category:Geological_techniques" title="Category:Geological techniques">Geological techniques</a></li><li><a href="/wiki/Category:Hole_making" title="Category:Hole making">Hole making</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Articles_needing_additional_references_from_November_2017" title="Category:Articles needing additional references from November 2017">Articles needing additional references from November 2017</a></li><li><a href="/wiki/Category:All_articles_needing_additional_references" title="Category:All articles needing additional references">All articles needing additional references</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 5 November 2024, at 21:21<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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