n. a zone in the upper mantle of the earth; consisting of hot plastic rock that underlies the solid lithosphere
The asthenosphere is estimated as being from 50 to several hundred miles thick.
The asthenosphere is estimated as being from 50 to several hundred miles thick.
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lower layer of the crust; below the lithosphere; zone in upper mantle
inner core
4 syllables
as-then-o-sphere
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