Asthenosphere

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