Unit Test — Cumulative exam Answers

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Which is one benefit that mangrove trees provide to surrounding coastal wetlands?

They hold soil in place.

They store floodwaters.

They maintain surface water flow.

They filter water and improve water quality.

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Which is an issue that governments must consider before passing conservation policies?

urbanization implications

cost to implement conservation policies

desertification implications

cost to implement deforestation

Which action has a positive effect on air resources?

using fossil fuels

building new homes

walking to work or school

removing vegetation such as trees

Which feature separates watersheds?

basins

bays

ridges

rivers

Which is a cause of desertification?

farming

creating reservoirs

overgrazing

driving motor vehicles

Which statement explains one way that lakes form?

Lava flows block a river.

Streams flow into shallow areas.

Groundwater feeds into low-lying areas.

Grassy wetlands get covered by a stream.

What percentage of Earth’s water is fresh water?

3 percent

25 percent

75 percent

97 percent

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