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'''Ice''' is the [[solid]] phase of [[water]]. At one atmosphere of [[pressure]], ice melts at 32 degrees [[Fahrenheit]] (0 degrees [[Celsius]]). There are up to 17 different kinds, or ''phases'', of ice, but the only type found in abundance on earth is known as ''Ice I<sub>h</sub>''.<ref>''See'', ''e''.''g''. New York University, [http://www.nyu.edu/pages/mathmol/txtbk2/topic7.htm About Water and Ice]; Martin Chaplin, [http://www1.lsbu.ac.uk/water/ice1h.html Hexagonal Ice (Ice Ih) structure]</ref>
:''For [[ICE]], see [[Immigration and Customs Enforcement]]''
[[Image:Ice cube clump melting.jpg|right|250px]]
'''Ice''' is frozen [[water]]. At one atmosphere of [[pressure]], water turns into ice at 32 degrees [[Fahrenheit]] (0 degrees [[Centigrade]], or 273.15 [[kelvin]]s).
Due to the nature of its crystalline structure, ice is slightly less dense than liquid water, causing it to float.
Due to the nature of its crystalline structure, ice is around 10% lighter than liquid water, which is why ice cubes float in your drink and [[iceberg]]s float in sea water.
70% of the world's fresh water is ice, almost all of it located at the polar ice caps in [[Antarctica]] and the [[Arctic]] (compared to the ice caps, the amount of ice stored in freezers in warmer areas is negligible). However, this only constitutes a small percentage of the Earth's overall water reserves<ref>[http://www.globalchange.umich.edu/globalchange2/current/lectures/freshwater_supply/freshwater.html The Water Resources of Earth]</ref>.
70% of the world's fresh water is ice, almost all of it located at the polar ice caps in [[Antarctica]] and the [[Arctic]].
==References==
==See also==
*[[Ice Bucket Challenge]]
[[category:Chemistry]]
==External links==
* [http://www.globalchange.umich.edu/globalchange2/current/lectures/freshwater_supply/freshwater.html The Water Resources of Earth]
[[Category:Chemistry]]