Desertification of North America's drylands is primarily the result of
A) plowing for crop production.
B) livestock grazing.
C) fires and the use of modern irrigation systems.
D) global climate change.
B
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Compared to long-term historic changes in the average temperature of the atmosphere, which of these best characterizes the current warming trend?
A. rapid B. slow C. very similar D. non-existent, the earth is cooling
Which of the following is NOT a method by which to achieve more sustainable use of nonrenewable mineral resources?
a. Reduce waste, recycle, and reuse. b. Slow population growth. c. Find substitutes. d. Reduce mining subsidies. e. Remove minerals faster so the mining processes do not pollute the air for as long a time period.
During which of the following stages is an ordinary thunderstorm most intense?
A. dissipating stage B. multicell stage C. mature stage D. cumulus stage
In a region where severe thunderstorms with tornadoes are forming, one would not expect toobserve:a
a strong ridge of high pressure over the region. b. a dry tongue of cold air between the 700 and 500 mb levels. c. the polar jet stream above the region. d. moist warm air moving north at about the 850 mb level.