Which of the following is not a way to add carbon dioxide to the atmosphere?
A) burning fossil fuels.
B) cooling of the oceans.
C) warming of the oceans.
D) land clearing for agriculture.
Answer: B
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Which of the following phenomena are exemplified by the "smoke" of the Great Smoky Mountains and the "blue" of the Blue Ridge Mountains?
A. sundogs B. haze C. halos D. glories
The United States has a very ________ percentage of farmers similarly to other ________ countries. A small number of farmers can feed many people in part because of the propensity of ________
A) high, developing, farmers B) low, developed, machinery C) low, democratic, subsidized farming D) high, northern hemisphere, subsidized farming E) high, developed, genetically modified crops
Waves that approach the shore at an angle produce a longshore current that flows parallel to the beach.
Answer the following statement true (T) or false (F)
Primary succession occurs when a community develops ________ while secondary succession occurs when one ________.
A. And then fails; niche changes B. On bare rock; biological community replaces another C. And replaces another; ecosystem becomes stable D. Intraspecific competition; experiences interspecific competition E. Into a climax community; species replaces another