Unit 4 Review

Trees can be classified as different kinds of resources. Which of these statements gives a reason for classifying a tree as an energy resource?

• It requires energy to grow a tree

• It can be burned to provide heat

• It can be used to build a home

• It is a renewable resource

How is geothermal energy used?

• Moving water turns a turbine to produce electricity

• Heated water warms buildings or generates electricity

• Wind turns a mill that makes a generator work

• Material is burned to cook food or drive engines

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About what fraction of Earth’s surface is covered by water?

• 1/2

• 3/4

• 9/10

• 1/4

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How is the conservation of renewable resources different from the conservation of nonrenewable resources?

• The conservation of renewable resources focuses on disposing of wastes

• The conservation of renewable resources focuses on making global agreements

• The conservation of renewable resources focuses on increasing efficiency

• The conservation of renewable resources focuses on preserving the resource

The diagram to the side shows a process that occurs in most ecosystems on Earth.

In addition to oxygen, which product should appear in the diagram?

• sugar

• nitrogen

• soil

• ozone

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Some renewable energy sources are powered by the sun. What is another source for renewable energy?

• other planets in the solar system

• electronic devices

• nuclei

• the composition of Earth

A natural resource is best defined as any naturally occurring material that is which of the following?

• mined from Earth

• used by people

• unlimited in quantity

• left untouched in nature

Which of the following is a basic necessity humans need to survive?

• books

• money

• water

• electricity

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The picture to the side shows how a person cleaned leaves from his lawn in two different years.

What was a result of the change the person made from Year 1 to Year 2?

• The person caused a reduction in the number of leaves that fell

• The person increased the pollution he produced

• The person cleaned his lawn faster

• The person reduced his use of natural resources

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Why does Earth have an atmosphere but Mars and Mercury do not?

• No liquid water exists on Mars and Mercury.

• Mars and Mercury are too close to the sun.

• Ultraviolet radiation from the sun burned away the atmospheres of Mars and Mercury.

• The gravitational pull of Mars and Mercury is too small.