Plural of eustacy; instances or changes in global sea level caused by factors affecting ocean volume or basin capacity.
From eustacy, derived from Greek eu- (well) + stasis (standing/stable), referring to uniform changes across all oceans.
Eustacies reveal Earth's climate history—by studying sea-level changes locked in ancient rocks, geologists can read the story of ice ages and how much water the oceans held millions of years ago.
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