Air pollutants can come from both natural sources and human activities
a. True
b. False
ANSWER: True
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The vegetation associated with the subarctic climate closely resembles the vegetation associated with the tundra climate
Indicate whether the statement is true or false
On a world map of climate regions, the lines that separate the regions mark locations of abrupt changes in temperature or precipitation conditions
Indicate whether the statement is true or false
When was the federal ban on chlorofluorocarbons (ozone-depleting chemicals) enacted?
A. 1964 B. 1969 C. 1974 D. 1978 E. 1984
Which of the below correctly describes the ice in a mountain glacier?
A) never stops moving downhill B) moves downhill only during times of high temperature C) moves downhill when snow accumulation exceeds ablation D) On the average, it moves downhill once every hundred years. E) never stops moving uphill