https://en.bharatpedia.org/w/index.php?action=history&feed=atom&title=Oceanic_crust 2026-08-23T08:38:36Z Revision history for this page on the wiki MediaWiki 1.43.6 https://en.bharatpedia.org/w/index.php?title=Oceanic_crust&diff=309434&oldid=prev 2021-01-24T00:59:18Z

<p>robot: Creating new article from <a href="/wiki/Special:WantedPages" title="Special:WantedPages">Special:WantedPages</a></p> <p><b>New page</b></p><div>[[Image:Earth_seafloor_crust_age_1996_-_2.png|thumb|300px|Age of oceanic crust]]<br /> The &#039;&#039;&#039;oceanic crust&#039;&#039;&#039; is the part of Earth&#039;s [[lithosphere]] that is under the [[ocean]] basins.<br /> <br /> Oceanic crust is primarily composed of [[mafic]] rocks, or [[Sima (geology)|sima]] which is named for its [[magnesium]] [[silicate mineral]]&lt;nowiki/&gt;s. It is thinner than continental crust, and is about 7-10 kilometers thick, however it is more dense, having a mean [[density]] of about 3.3 [[gram|g]]/[[centimeter|cm]]&lt;sup&gt;3&lt;/sup&gt;.<br /> <br /> Oceanic crust generally does not last longer than 200 million years. In the [[rock cycle]], it is continuously created at oceanic ridges. At these ridges, hot [[magma]] rises into the crust and cools, pushing the crust apart at the ridge. The continuous formation of new oceanic crust pushes the older crust away from the mid-ocean ridge. As it moves away from the ridge, the crust becomes cooler and denser, while the sediment may build on top of it.<br /> <br /> ==See also==<br /> *[[Continental crust]]<br /> <br /> ==References==<br /> {{reflist}}<br /> <br /> ==Sources==<br /> *Marshak, Stephen. (2005) Earth: Portrait of a Planet (41-87)<br /> <br /> == External links ==<br /> *[http://volcano.und.edu/vwdocs/vwlessons/plate_tectonics/part9.html Testing the Sea-Floor Spreading Hypothesis] {{Webarchive|url=https://web.archive.org/web/20071023090129/http://volcano.und.edu/vwdocs/vwlessons/plate_tectonics/part9.html |date=2007-10-23 }}<br /> <br /> [[Category:Geology]]<br /> <br /> {{science-stub}}</div>

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