| 单词 | asthenosphere | 
| 释义 | asthenosphere [as`then·ǝ´sfir]  GEOLOGY That portion of the upper mantle beneath the rigid lithosphere which is plastic enough for rock flowage to occur; extends from a depth of 30-60 miles (50-100 kilometers) to about 240 miles (400 kilometers) and is seismically equivalent to the low velocity zone.  | 
	
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