what is asthenosphere?
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Asthenosphere is a region on the earth's upper mantle that is highly ductile and viscous. The region also has weak mechanical properties. It is located just beneath the lithosphere (crust and upper most solid mantle) and its depth ranges from 80 to 200 kilometers from the earth's surface. The boundary between the lithosphere and asthenosphere is called LAB. Due to the high temperature and pressure in the region, rocks are ductile.
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The upper layer of the earths mantle,bellow the lithosphere,in which there is relatively low resistance to plastic flow and convection is thought to occur.
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