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<p></p> <p><b>New page</b></p><div>[[Image:Topo.jpg|thumb|350px|The thickness of the Earth&#039;s crust (km).]]<br /> <br /> The &#039;&#039;&#039;continental crust&#039;&#039;&#039; is the layer of [[granite|granitic]], [[sedimentary rock|sedimentary]], and [[metamorphic rock]]s which form the [[continent]]s and the areas of shallow seabed close to their shores, known as [[Continental shelf|continental shelves]].<br /> <br /> It consists mostly of [[feldspar]] and other [[sial]]ic rocks. It is less [[dense]] than the material of the Earth&#039;s [[Mantle (geology)|mantle]], which consists of [[mafic]] rock. Continental crust is also less dense than [[oceanic crust]], though it is considerably thicker; mostly 35 to 40&amp;nbsp;km versus the average oceanic thickness of around 7–10&amp;nbsp;km. About 40% of the Earth&#039;s surface lies on-top of continental crust.<br /> <br /> The continental crust is separated from the [[oceanic crust]] by the [[continental margin]].<br /> <br /> == See also ==<br /> * [[Oceanic crust]]<br /> <br /> == References ==<br /> * Butler, Rob, [http://earth.leeds.ac.uk/assyntgeology/extra_info/ehistory.htm Making new continents] {{Webarchive|url=https://web.archive.org/web/20060620032323/http://earth.leeds.ac.uk/assyntgeology/extra_info/ehistory.htm |date=2006-06-20 }} Accessed 01/29/2006<br /> * Saal, A.L., Rudnick R.L., Ravizza G.E. &amp; Hart S.R., 1998. &#039;&#039;Re-Os [[isotope geochemistry|isotope]] evdence for the composition, formation and age of the lower crust.&#039;&#039; Nature, 39317, 1998.<br /> * Taylor and McLennan, 1995, &#039;&#039;Model of growth of continental crust through time&#039;&#039; in John Victor Walther, 2005, &#039;&#039;Essentials Of Geochemistry&#039;&#039;, Jones &amp; Bartlett, {{ISBN|0-7637-2642-7}}<br /> * von Huene, R. and D.W. Scholl, 1991. &quot;Observations at convergent margins concerning sediment subduction, subduction erosion, and the growth of continental crust.&quot; Reviews of Geophysics, 29, 279-316.<br /> <br /> ==External links==<br /> *[http://www.geo.cornell.edu/geology/classes/geochemdata/CrustalAbundances.html Average composition of Continental Crust]<br /> *[http://quake.wr.usgs.gov/research/structure/CrustalStructure Crust 5.1] {{Webarchive|url=https://web.archive.org/web/20080908040832/http://quake.wr.usgs.gov/research/structure/CrustalStructure |date=2008-09-08 }}<br /> <br /> [[Category:Geology]]</div>

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