The reduction of outdoor air pollution in the United States has been so successful because:
a. The U.S. Congress supported it and diligently crafted laws to ensure its success.
b. U.S. citizens insisted that the laws be passed.
c. The country is affluent enough to afford the controls and improvements it required.
d. All of these answers are correct.
e. Only U.S. citizens insisted that the laws be passed and the country is affluent enough to afford the controls and improvements it required are correct.
E
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A) all B) 4 C) 2 D) 1 E) none
Krypton-85 has a half-life of 10. years. Approximately what percentage of Kr-85 produced from the Chernobyl accident in 1986 still remains radioactive in 2010?
A) 25% B) 12% C) 6% D) 3%
Which of the following locations is warmest in summer?
A) Seattle, Washington B) Los Angeles, California C) Anchorage, Alaska D) Charleston, South Carolina
The surface mixed zone is characterized by ________
A) high density water near the surface that rapidly decreases in density with depth B) a mixture of temperatures and densities to a depth of about 300 to 450 meters depth. C) low density water near the surface that rapidly increases in density with depth D) a rapid change from warm temperatures on top to cold temperatures at a depth of about 300 meters E) nearly constant temperatures to a depth of about 300 meters