The Water Cycle Answers

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Nearly 50% of water sources in the United States are believed to be polluted.

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Why is nonpoint source pollution potentially more harmful than point source pollution?

Nonpoint source pollution disrupts the water cycle.

Nonpoint source pollution is difficult to regulate.

Nonpoint source pollution comes from more than one source.

Nonpoint source pollution is more damaging to living organisms than point source pollution.

Plants and animals are comprised mainly of _______.

protein

carbohydrates

water

muscle

Which of the following contributes to nonpoint source pollution in water?

automobiles

oil refineries

paper mills

water treatment plants

Why does the government not do more to regulate nonpoint source pollution?

Nonpoint source pollution is less harmful to the environment, so it does not need to be regulated.

Point source pollution is more common than nonpoint source pollution, so it is more regulated.

Nonpoint source pollution is caused solely by animals, which are not possible to regulate.

Nonpoint source pollution is difficult to regulate, because its source is difficult to track.

Living organisms do not play a role in the water cycle.

What happens to water in the atmosphere as it rises?

It evaporates.

It condenses and forms clouds.

It combines with other gases in the air.

It is used up.

The water on the Earth today has been sustaining life for millions of years.

How much of the Earth’s water is usable as a freshwater resource?

75%

100%

25%

How does water enter the atmosphere?

Liquid water evaporates from lakes when heated by the sun.

Frozen water sublimates from ice and snow.

Liquid water is lost from tree leaves during evapotranspiration.

All of the above.

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