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specify which kind of ice is less dense than water
'''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>
'''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 I<sub>h</sub> is slightly less dense than liquid water, causing it to float.
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]] (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>.