Question

Why is the upper mantle called asthenosphere

Answer 1

Explanation:

The upper mantle can be divided into the thin layer that, together with the crust, is called the lithosphere and the hot, fluid asthenosphere below the lithosphere. This lower layer is responsible for the movement of tectonic plates. We know about the composition of the upper mantle because of lava from volcanoes.

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Answer 2

Answer:

because The upper mantle is not uniform throughout.Below the lithosphere is a layer of upper mantle called the asthenosphere.This is made up rock that is fluid and can move.It is this fluidity that powers the movement of the tectonic plates of the Earth's crust. therefore upper mantle is called....

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