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Water and life

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Water Water has 2 very important roles! But anyway, without water no life would exist on earth, it is the most important biochemical of all. Three quarters of the earth is covered with water. 1.Role 70-95% percent of a cell contains water. The human body for example contains about 60% water. 2.Role An environment for all organisms, which live in water. Such a small molecule would exist as a gas at normal Earth temperatures were it not for its special property of hydrogen bonding to other water molecules. In water (used as a medium) molecules and ions can mix in and hence a medium. In this medium life could envolve. Hydrogen Bonds are hard to break and hard to convert from liquid standard to a gas. Therefore a lot of energy is needed. Because of this qualitys, it is difficult to separate the water molecules and to affect the physical properties of water. ...read more.


Properties of water Thermal properties But the fact, that hydrogen bonds are hard to break, is not only good. A lot of energy is needed, to move the water molecules and so to raise the temperature of water. But anyway, that's not so bad, because it makes water more stabile. For example if in summer the temperature of an ocean raises, the water won't get cold in the winter very fast. Another example is the human body, which contains about 60% water. The water in the human body, or rather the water molecules in the water, makes the body temperature more stabile and make it harder to change the temperature. Another advantage for the human body and for the living organisms in water is, that water doesn't freeze so fast. Because a lot of energy is needed, to change water into a gas, during the progress of evaporation a lot of energy is transfered. ...read more.


Glaciers and icecaps: A storehouse of fresh water Almost 10% of the world's land mass is currently covered with glaciers, mostly in places like Greenland and Antarctica. Glaciers begin their life as snowflakes. When the snowfall in an area far exceeds the melting that occurs during summer, glaciers start to form. The weight of the accumulated snow compresses the fallen snow into ice. These "rivers" of ice are very heavy, and if they are on land that has a downhill slope the whole ice patch starts to slowly slide downhill. The size of glaciers varies, some are as big as a football-field, some are as bis as a river a hundred meters long. If all glaciers melted today the seas would rise about 260 feet. Water withdrawals e.g. United States in 1995 Public supply (water delivered to our homes and businesses by water departments) Domestic (water use at home) Irrigation (water for growing crops, golf courses, etc.) Thermoelectric power (electrical-power generation, other than hydroelectric) Livestock (water for cows, chickens, horses, etc.) Hydroelectric power (power produced at dams) Wastewater treatment (sewage treatment) ...read more.

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