2 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: asthenosphere \asthenosphere\ n. 1. the lower layer of the earth's crust, below the lithosphere. It is estimated as from fifty to several hundred miles thick. It is less rigid than the lithosphere, but still rigid enough to transmit some transverse seismic waves. --[RHUD] [WordNet 1.5 +PJC] From WordNet (r) 2.0 [wn]: asthenosphere n : the lower layer of the crust
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