Answer:
The asthenosphere is a layer of the earths crust. There are various definitions here is one of them from a geology resources definition list:
"A layer of soft but solid, mobile rock comprising the lower part of the upper mantle from about 100 to 350 kilometers beneath the Earth's surface."
"A layer of soft but solid, mobile rock comprising the lower part of the upper mantle from about 100 to 350 kilometers beneath the Earth's surface."
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