The asthenosphere is the mechanically weak and ductile region of the upper mantle of Earth. It lies below the lithosphere, between approximately 80 and 200 km below the surface, and extends as deep as 700 km. However, the lower boundary of the asthenosphere is not well defined
the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
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Answer:
The asthenosphere is the mechanically weak and ductile region of the upper mantle of Earth. It lies below the lithosphere, between approximately 80 and 200 km below the surface, and extends as deep as 700 km. However, the lower boundary of the asthenosphere is not well defined
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Explanation:
the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
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