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Sea level rise arises principally from

  • A.increased rainfall over the open ocean
  • B.changes in the ocean tides
  • C.thermal expansion and melting land ice
  • D.the melting of the floating sea ice

Answer: C

Sea ice is already floating and its melting does not raise the level appreciably. Thermal expansion dominated in the twentieth century and land ice loss has grown in importance since. Floating ice contributes almost nothing.

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