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it's more
that Antartica is a fucking great big land mass covered in ice, and it'll all run into the sea if it melts instead of being all high up and not contributing to the sea levels.

(although the stuff that's floating.. if it all melted would lower the sea levels a teeny but. not much though)

edityedit. the reason the level goes up in the glass when you only have a small amount of water is they're not contributing to the water level when they're stacked at the bottom of the glass... if they were floating the level would drop. :-)
(, Sat 13 Jan 2007, 1:26, archived)
If you see an iceberg floating in the sea
By far most of it is already under water.
(, Sat 13 Jan 2007, 1:32, archived)
this is indeed true.
7/8ths or so. this is because ice is only slightly less dense than water. (water's at its most dense at around 4 degrees C, I believe...)

edit: and because the floating ice becomes more dense when it melts, it has less volume, so the water level drops *slightly*. would be counteracted by the huge amount of ice sitting on land melting though
(, Sat 13 Jan 2007, 1:34, archived)
a lot of the arctic is touching land at the bottom though
and is higher compared to the water than it would be if it were floating freely
(, Sat 13 Jan 2007, 1:34, archived)