Evaporation and transpiration from continental areas amount to only about ____ percent of the nearly 1.5 billion gallons of water vapor that annually evaporate into the atmosphere.?
a. ?15
b. ?20
c. ?25
d. ?30
e. ?35
ANSWER: a
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a. It allows the wind to blow across the slopes, imparting a stress that triggers landslides. b. It allows farming activity that exposes soil to erosion and mass wasting. c. It kills tree roots that help hold the slopes in place, allowing mass movement. d. It allows excess rainfall runoff to erode the landscape, triggering mass wasting.
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