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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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
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The speed of mud movement depends on the slope angle and on the water content.
a. true b. false
Environmental & Atmospheric Sciences