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| | Crust (geology) - Wikipedia, the free encyclopedia |
 | | The oceanic crust (sima) is 5 to 10 km thick and is composed primarily of a dark, dense rock called basalt. |
 | | The crust forms not so much by accumulation of granite and metamorphic fold belts, but by depletion of the mantle to form buoyant lithospheric mantle. |
 | | In geology, a crust is the outer layer of a planet, part of its lithosphere. |
| en.wikipedia.org /wiki/Crust_(geology) (427 words) |
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