[Alberta's Child]

In addition, water is the only substance on earth that contracts as it melts. Therefore, the volume of space occupied by a melted ice cube is less than the volume of space that it occupied when it was a cube.

Having said that, there is no reason to assume that melting glaciers would have no impact on sea level. When the glacier is frozen, the water isn't in the sea -- so when it melts, the water flows down and increases the volume of the body of water underneath it.

[Dan Evans]

In addition, water is the only substance on earth that contracts as it melts.

Except for bismuth.