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10 points
ISOSTASIES is validvalid
ISOSTASY, the state of balance in the earth's crust [n]
ISOSTASY, the state of balance in the earth's crust, also ISOSTACY [n]
ISOSTASY, the state of balance in the earth's crust [n]
ISOSTASY, the state of balance in the earth's crust, also ISOSTACY [n]