What is the percentage of the land surface covered by arid regions?

a. ~ 1 %
b. ~ 5 %
c. ~ 25 %
d. ~ 40 %


Ans: c. ~ 25 %

Environmental & Atmospheric Sciences

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Some of the advantages of planting trees in cities are that they

A. Provide shade B. Improve air quality C. Act as noise barriers D. Improve the aesthetics E. All of these are correct

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Explain how poverty drives population growth

What will be an ideal response

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Which of these numbered features contains the least amount of Earth's water?



A) 1 Ocean
B) 2 Atmosphere
C) 3 Glaciers and ice sheet
D) 4 Groundwater
E) 5 Lakes

Environmental & Atmospheric Sciences

The speed of mud movement depends on the slope angle and on the water content.

a. true b. false

Environmental & Atmospheric Sciences