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Melting the north polar ice cap would raise ocean levels very little, for the same reason ice cubes melting in a glass of water do not overflow the cup. Ice occupies more volume than the water it displaces, which is why it floats. There would be SOME increase from thermal expansion.

The Greenland ice cap would add about seven meters (23 feet) to ocean levels. But when Antarctica melts (perhaps as little as a dozen centuries from now), ocean levels will rise 60 meters. Much of Hawaii is volcanic mountains well above sea level, but of lot of the area would be submerged. Low coastal areas around the world will flood.

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Q: What would happen to Hawaii if the polar caps melted?
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