What is the innermost rigid part of the mantle called ........

World Geography (Easy) World Physical Aspects

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What is the innermost rigid part of the mantle called?

Thermosphere

Mesosphere

Asthenosphere

Lithosphere

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Explanation:

Earth's lithosphere includes the crust and the uppermost mantle, which constitutes the hard and rigid outer layer of the Earth. The lithosphere is subdivided into tectonic plates. The lithosphere is underlain by the asthenosphere which is the weaker, hotter, and deeper part of the upper mantle.