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The Importance of Water Water plays a huge role in animals, plants and the surroundings. Without water there would be no life on the planet. The importance of water as a medium of life springs from four of its properties, freezing, heat capacity or thermal properties, surface tension and its solvent properties. Water is most dense at 4° but freezes at 0°. This is a very important factor in the creation of life. If a lake or ocean was to freeze, the ice would float on top of the surface; this allows single celled organisms, fish and other aqueous creatures to survive underneath the ice. If water wasn't most dense at 4° the whole lake, or lots of the ocean would freeze over and kill the life. The polar ice caps float above the water, if they sunk the warmer water underneath the surface would slowly melt the ice...

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