What type of desert region includes the Sahara Desert of north Africa?
a. polar
b. subtropical
c. rain shadow
d. midlatitude
e. coastal
B
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Which is the most widely used energy source in poor, less-developed countries?
A. solid biomass B. liquid biomass C. wind D. geothermal
CAM plants can minimize water loss by
A) leaving their stomates closed during dry periods. B) suspending photosynthesis when the solar radiation is too intense. C) having leaves shaped like umbrellas, which minimizes evaporation. D) storing water in their stems during wetter periods.
Pressurized fluid and chemicals injected into a well are used in a mining process called ________.
A. High pressure welling B. Heap-leach extraction C. Hydraulic fracturing D. Placer mining
In high pressure centers, air spirals downward from above and inward at the surface.
a. true b. false