English

Noun

asthenosphere ‎(plural asthenospheres)

1. (geology) The zone of the Earth's upper mantle, below the lithosphere.
   • 2003, Bill Bryson, A Short History of Nearly Everything, BCA, p. 192:

     To say that the lithosphere floats on top of the asthenosphere suggests a degree of easy buoyancy that isn't quite right.

   • 2004, Richard Fortey, The Earth, Folio Society 2011, p. 79:

     The asthenosphere that underlies the surface plates is not liquid in any vernacular sense, although it is relatively plastic.

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