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What does eustasy mean?

Looking for the meaning or definition of the word eustasy? Here's what it means.

Noun
  1. A worldwide change in sea level, especially one caused by melting ice or tectonic activity. [from 1940s]
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Examples
During this period of initial flooding the new sea is sensitive to changes in climate and eustasy.
Tectonics and eustasy were the two main controls on platform development.
This study demonstrates efficacy of interregional correlation of sea-level changes for resolution of the problem of the alternative views of the Jurassic eustasy.
Subtidal, carbonate and carbonate-clastic symmetric cycles are interpreted to form when the long-term, tectonically driven eustasy prevails over glacioeustasy.
Eustasy is defined as a global sea level change when referenced to a fixed datum, for instance the center of the earth.
Despite some datation uncertainties and the unknown durations of Lower Jurassic cycles, middle frequency sequences appear to be controlled by eustasy.

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