Unit Test — Unit test Answers

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Which step of desalination must be done before water is condensed and collected?

Water is heated until it evaporates.

Water is frozen, so it becomes ice.

Water is transported from one area to another area that has little water.

Water is collected and salt is allowed to settle at the bottom.

Which best explains the effect of reforestation on land?

It allows crops to grow in wide steps along slopes.

It turns land slowly into desert.

It turns habitable land uninhabitable.

It restores trees to areas where they once grew.

Which statement describes clean air as a natural resource?

Clean air can always be found indoors.

Clean air provides nitrogen gas for plant respiration.

Clean air is produced when high levels of ultrafine particles circulate.

Clean air reduces the risk of illnesses and other health problems.

Examine the pictures.

coal

gasoline

oil

wind

Which activity uses water for both recreational and industrial purposes?

machinery cooling

waterskiing

irrigation

fishing

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