it extends from the surface of earth to a depth of about 70-100 km and liquid upper part of the upper mantle .
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it extends from the surface of earth to a depth of about 70-100 km and liquid upper part of the upper mantle .
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Answer:
LITHOSPHERE
EXPLANATION:
The lithosphere is physically distinct from the below-lying layers due to its cool temperatures and typically extends 70-100 km in depth. Below the lithosphere is the asthenosphere layer, a much hotter and malleable portion of the upper mantle.