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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>
'''Ice''' is the [[solid]] phase of [[water]]. At one atmosphere of [[pressure]], ice melts at 32 degrees [[Fahrenheit]] (0 degrees [[Celsius]]). There are more than 17 different kinds, or ''phases'', of ice,<ref>''See'' Martin Chaplin, [http://www1.lsbu.ac.uk/water/ice.html The ice phases of water]</ref> 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>
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 slightly less dense than liquid water, causing it to float.