isostasy

definition: 
The equilibrium that exists between parts of the earth’s crust, which behaves as if it consists of blocks floating on the underlying mantle, rising if material (such as an ice cap) is removed and sinking if material is deposited.
sentence: 
We know from isostasy that the crust responds to changing load distributions on its surface by vertical movements.
difficulty: 
medium
toefl frequency: 
1
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