Unit Test — Unit test Answers

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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.

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Which material is a part of bedrock?

silt

plants

wood

water

Which energy source would provide affordable, abundant, easy to produce electricity for a factory?

solar panels

wind turbines

gas generators

a hydroelectric plant

Why was 1990 an important year regarding air quality?

The United States took first steps to keep the air clean.

The United States created the Environmental Protection Agency.

Modifications and improvements were made to the Clean Air Act.

Funding was established under the Clean Air Act to study air pollution.

How would living things most likely be affected if there were a shortage of water on Earth?

Living things would not be able to live, reproduce, or regulate their own temperature.

Living things would not be able to absorb and transport heat or regulate their own temperature.

Living things would not be able to reproduce or absorb and transport heat.

Living things would not be able to regulate their own temperature, live, or absorb or transport heat.

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