What does asthenosphere mean?

asthenosphere meaning in General Dictionary

the lower layer of the earths 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

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  • the low level of crust

asthenosphere meaning in Etymology Dictionary

level associated with world's upper mantle, 1914, from Greek asthenos (see asthenia) + sphere.