Discussion
All of the following contribute to global sea level rise EXCEPT
Answer: A
Correct answer: melting of Arctic sea ice
Sea ice already floats, so it displaces its own weight of water and its melting leaves the level essentially unchanged - Archimedes’ principle. The other three all add: thermal expansion of the warming ocean, and mass transferred from land to sea by the Greenland ice sheet and by mountain glaciers. Expansion and land ice each account for a large share of the observed rise.
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