eustatically

• a word derived from eustasy.
  eustasy

  noun

  any uniformly global change of sea level that may reflect a change in the quantity of water in the ocean, or a change in the shape and capacity of the ocean basins.
• a word derived from eustatic.
  eustatic

  adjective

  denoting or relating to worldwide changes in sea level, caused by the melting of ice sheets, movements of the ocean floor, sedimentation, etc

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