Which of the following is the primary component of photochemical smog?
A. ozone
B. carbon dioxide
C. nitric oxide
D. sulphur dioxide
Answer: A
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In the Northern Hemisphere, explain how/why the Earth is closer to the sun in winter than during summer and yet winter is colder.
What will be an ideal response?
Alaska has warmed twice as fast as the global average over the past 50 years. This has resulted in
A) amenity migration into Alaska. B) forced migration out of Alaska. C) increased spatial equality. D) increased infant mortality. E) increased life expectancy.
A prairie was covered by grasses and wildflowers. A farmer removed this native vegetation so he could plow the land and plant crops. For years, normal rain fell and the farm thrived
But after a few years of drought, the crops died and the topsoil on the farm eroded. Explain how the farmer's use of the land led to the erosion that occurred there.
The West Siberian Plain contains the largest part of Europe's farmland
Indicate whether the statement is true or false