[mass noun](Geology)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 (地质)地壳均衡
派生 isostatic adjective 语源
late 19th cent.: from iso- 'equal' + Greek stasis 'station'