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The volume of salt water in the oceans composes over 97% of the earth's water. Of the remaining 3% which is fresh water, 75% is more or less permanently stored in the ice caps and 25% is stored benath the surface of the land. Only a small amount of this ground water can be withdrawn in signifcant amounts. One third of 1% of fresh water is in lakes and rivers.
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LaoEarth's water comprises what we call the 'hydrosphere'. The Hydrosphere is part of the planet's 'biosphere', which includes the atmosphere, the surface of the Earth and all living things. Therefore, by definition ALL of the hydrosphere is available to animals and indeed no mater where you look water will contain life.
There is also water dispersed in the rocks of the Earth's mantle and this water is not available to animals, however over geological time this water is recirculated to the hydrosphere as part of Earth's macro hydrological cycles.
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How much of all fresh water on Earth can be used by people and other land organisms?
The amount of Earth's water that is usable as a freshwater resources can vary. There is a very large percentage of freshwater available, but much of it is unobtainable.
How does geotropism help a plant survive?
geotropism is the ability of the plant to grow in he direction of gravity so if there isn't sufficient water available the roots of the plant due to geotropism go deeperinto the the earth so as to obtain some amount of water which will help them to survive
Is the water on earth the same as from the water years ago?
During global warming all of the water was frozen leading to not much water now that it got warmer (green house affect ) there is more water now than then written by a fifth grader
How much of the earth is ready for use by humans?
Less than 1 percent of Earth's water is ready for use by humans. Earth is approximately 71 percent water but of all this water only about 2.5 percent is fresh water with the rest being salt water and thus not fit for human consumption. Of the 2.5 percent fresh water the majority of this is frozen in the polar icecaps, present in soil moisture or deep underground where it is out of reach.
Why does the amount of water on earth stay constant?
There is the same amount of salt that goes out of the water to the salt that comes in the water so that is how it remains balance. Actually the oceans are slowly getting more and more salty, due to dissolved salts from the land in river water.
