Question

Why the rocks in the upper portion of the mantle are more rigid and brittle?

Answer 1

Answer:

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Answer 2

Explanation:

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 rock called the Lithosphere.The asthenosphere is the part of the mantle that flows and moves the plates of the Earth.

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