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Why ice is lighter than water? Hydrogen bonding gives ice a rather open structure with wide holes. Thus for same volume of water and ice , ice has less mass so it is lighter than water.
The height a body of water is affected by gravity, so the more mass land has the more an ocean is pulled towards it. Needless to say, because of this, the melt water from the Greenland icesheets will cause higher water levels in the southern hemisphere, while lowering the water levels in the nothern hemisphere.