Unit Test — Unit test Answers

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21
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Which federal agency helps foreign governments with international conservation efforts?

A
US Forest Service
B
US Fish and Wildlife Service
C
Bureau of Land Management
D
National Park Service
23

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

A
Water is heated until it evaporates.
B
Water is frozen, so it becomes ice.
C
Water is transported from one area to another area that has little water.
D
Water is collected and salt is allowed to settle at the bottom.
24

A landscaper is shopping for landscaping materials. She wants to use materials through which water flows easily.Which two materials should she choose?

A
clay and gravel
B
gravel and loosely packed soil
C
granite and rocks with cracks
D
rocks with cracks and clay
25

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

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