Unit 3: Human Energy Needs CA Study Guide

Clothes are often made from cotton, which is grown from a plant. What kind of resource is cotton?

• Renewable

• nonrenewable

• mineral

• chemical

Which of the following best describes one way a farmer might reduce soil erosion on his farmland?

• by clearing ground vegetation

• by increasing ground vegetation

• by avoiding adding fertilizer to crops

• by planting crops randomly

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NGSS.MS-ESS2-2

Sheep, like many animals, are an important natural resource. The hair that grows all over their bodies is known as wool. Once a year, this wool is shaved off and then turned into yarn.

Why are sheep considered an important natural resource?

• Their wool is used to make paper.

• Their wool is used to make clothing.

• Their wool is used to make metal.

• Their wool is used to make food.

Tomato farmers in southern Florida plant large pine trees on the borders of their farms to help soil conservation. Which of the following best describes how these border trees help conserve the soil?

• The trees provide shade to reduce water loss.

• The trees act as a windbreak to reduce soil erosion.

• The trees attract animals that fertilize the crops.

• The trees protect the soil from acid rain.

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Scientists are working to develop cars that run on electricity or solar energy.

Why do scientists need to develop alternative forms of energy?

• Fossil fuels are limited, and burning fossil fuels is not good for the environment.

• Electric cars are less expensive to manufacture.

• People want a variety of choices when they purchase a car.

• Fossil fuels are unlimited, but they cause cars to break down more frequently.

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NGSS.HS-ESS3-4

Which of the following are the source of the majority of sulfur dioxide released into the atmosphere?

• coal burning power plants

• nuclear power plants

• automobiles

• cow emissions

Global warming, the increase of Earth's average surface temperature, can be affected by the

• Tyndall effect.

• greenhouse effect.

• ozone effect.

• precipitation effect.

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NGSS.MS-ESS3-5

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Which of the following is largely responsible for depleting Earth's ozone layer?

• CO2

• CFCs

• DDT

• PCBs

Which of the following terms best describes the idea of managing and carefully using Earth's resources?

• recycling

• reducing

• conservation

• conclusion

What is the most important reason to carefully protect sources of freshwater?

• Polluted freshwater can carry diseases to animals.

• Freshwater is not renewed by rainfall very often.

• Freshwater is not renewed by rainfall very often.

• Freshwater is a limited resource and all living things need it.

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NGSS.MS-ESS2-4