Unit Test — Unit test Answers

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21
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How does the construction of dams positively affect natural resources?

A
by providing water for irrigation and restoring trees to areas where forests once existed
B
by creating reservoirs, preventing flooding, and renewing destroyed ecosystems
C
by preventing flooding, creating reservoirs, and providing water for irrigation
D
by renewing destroyed ecosystems and restoring trees to areas where forest once existed
22
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An aggregate is one type of land resource. What is an aggregate?

A
a layer of solid rock found beneath soil
B
the top layer of soil
C
a natural mixture of sand, gravel, and crushed stone
D
a naturally occurring mineral or rock
24

Which federal agency protects ecosystems and supervises public access to forests?

A
Bureau of Land Management
B
National Park Service
C
US Forest Service
D
US Fish and Wildlife Service

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