Black lung disease results from
A. Careless strip-mining methods
B. The radioactivity around coal-fired power plants
C. Coal dust literally filling lungs like dust in a vacuum cleaner bag
D. The radioactivity in coal
E. Coal dust causing inflammation and fibrosis in lungs
Answer: E
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Which of the following is an ion?
A. Br2 B. HCl C. Au + 3 Br2 D. 2 H2 E. none of the above
In the United States, the use of synthetic pesticides has increased 10-fold between 1942 and 1997 . For the same time period, the crop loss to insects has
a. declined by 10% b. increased by 2% c. almost doubled from 10% to 13% d. stayed at exactly the same percentage e. declined by 50%
What would have happened to the earth if it were 10% closer to the sun?
A) Our sun would have burned out after a few hundred million years so life would not evolve. B) Our atmosphere would consist mainly of carbon dioxide. C) Liquid water and the water cycle would not exist. D) Our atmosphere would consist mainly of nitrogen.
____________________ is the study of human activity and its relationship to the earth's surface.
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