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Tides Near Port Orford, Oregon" title="Encore - Tides Near Port Orford, Oregon" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/stromatolites-in-glacier-national-park.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01b7c8e4c316970b-115si" alt="Stromatolites in Glacier National Park" title="Stromatolites in Glacier National Park" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/calcite-crystals-and-microbial-activity-within-the-earths-crust.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01b8d2816332970c-115si" alt="Calcite Crystals and Microbial Activity Within the Earth's Crust" title="Calcite Crystals and Microbial Activity Within the Earth's Crust" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/anza-borregos-rocky-backbone.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01b8d2751a75970c-115si" alt="Anza-Borrego鈥檚 Rocky Backbone" title="Anza-Borrego鈥檚 Rocky Backbone" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/ancient-fruit-from-an-ancient-land.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01bb09822070970d-115si" alt="Ancient Fruit from an Ancient Land" title="Ancient Fruit from an Ancient Land" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/okefenokee-tea.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01b8d2675ebf970c-115si" alt="Okefenokee Tea" title="Okefenokee Tea" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/archive-great-barrier-reef.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b0120a5093b60970b-115si" alt="Archive - Great Barrier Reef" title="Archive - Great Barrier Reef" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/encore-aletsch-glacier-in-switzerland.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01b8d27827b0970c-115si" alt="Encore - Aletsch Glacier in Switzerland" title="Encore - Aletsch Glacier in Switzerland" height="52" width="52"/></a> <a href="https://web.archive.org/web/20170521203324/http://epod.usra.edu/blog/2017/05/buena-vista-park-san-francisco.html"><img src="https://web.archive.org/web/20170521203324im_/http://epod.usra.edu/.a/6a0105371bb32c970b01b8d27f58ed970c-115si" alt="Buena Vista Park, San Francisco" title="Buena Vista Park, San Francisco" height="52" width="52"/></a> </div> <p><script type="text/javascript"> </script> <script type="text/javascript" src="https://web.archive.org/web/20170521203324js_/http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script></p> </div> </div> </div> <div id="usrafooter"> <div id="nav-inner"> Earth Science Picture of the Day is a service of  the <a href="https://web.archive.org/web/20170521203324/http://www.usra.edu/" target="_blank">Universities Space Research Association</a>.<br> </div> </div> </div> </div> </div> <script type="text/javascript">  </script> <script type="text/javascript"> var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-8562350-1']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 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