Question

Water is an important resource. Explain.

Answer 1

In most parts of the world, water is a scarce resource. That might seem strange, because there is so much water on Earth. Almost all of the water on Earth, more than 97 percent of it, is seawater in the oceans. The rest is called fresh water, because it does not have a high salt content. Most of the world’s fresh water is frozen solid in large glaciers in Antarctica and Greenland. Almost all of the fresh water that is available for human use is either contained in soil and rock below the surface, called groundwater, or in rivers and lakes. In most areas of the United States there is enough fresh water for human use. Yet usable fresh water is not as abundant as you might think. In some areas, like the arid Southwest, there is not enough water. In those areas, water has to be transported long distances from other places in human-made channels called aqueducts. Even in areas with plenty of fresh water, there are sometimes shortages. Rainfall is the only way that water supplies are replenished. During times of drought, when rainfall is below average for a number of years, water supplies can become dangerously low. Even when rainfall is adequate, water from rivers and lakes might be unusable because of pollution.

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Answer 2

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