Question

why is the middle mantle layer called as asthenosphere?

Answer 1

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Here is your answer.........

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Because of this the continents ride on the denser oceanic plates. The crust and the upper layer of the mantle together make up a zone of rigid, brittle rockcalled the Lithosphere . The layer below the rigid lithosphere is a zone of asphalt-like consistancy called theAsthenosphere .

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