why are there two distinct layers of the mantle?
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The Earth's crust itself is the upper layer of the Lithosphere. The lower layer is called the Asthenosphere which is a highly viscous, ductile region of the upper mantle. The boundary between the crust and the mantle is known as the Mohorovicic discontinuity.
The Earth's crust of two distinctive types: oceanic crust and continental crust. The former is more dense and less thicker.
The Earth's crust of two distinctive types: oceanic crust and continental crust. The former is more dense and less thicker.
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