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1)This layer is the most outermost layer and it is part of the crust and the upper mantle. The composition of the lithosphere is silicon, oxygen, aluminum, iron, calcium, and magnesium. The thickness of this layer is 60-300km.Apr 30, 2014
2)The Earth's Crust is like the skin of an apple. It is very thin in comparison to the other three layers. The crust is only about 3-5 miles (8 kilometers) thick under the oceans( oceanic crust ) and about 25 miles (32 kilometers) thick under the continents ( continental crust ).
3)Oceanic lithosphere is typically about 50-100 km thick (but beneath the mid-ocean ridges is no thicker than the crust). Continental lithosphere is thicker (about 150 km). It consists of about 50 km of crust and 100 km or more of uppermost mantle.
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the crust is a layer of the Earth surface which is in solid state
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