The Layers of the Earth and its Composition - FilipiKnow
Apr 01, 2022 It has an average thickness of 7 km, much thinner than the continental crust. It is composed of basalt, dark igneous rock with a density of 3.0 g/cm 3. 2. Mantle. The mantle comprises the majority of the Earth’s volume (more than 80%) and begins where the crust ends, down to a depth of 2,900 km.
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