What percentage of electrical power in the U.S. is generated from nuclear sources?
a. ?less than one percent
b. ?five percent
c. ?10 percent
d. ?15 percent
e. ?20 percent
ANSWER: e
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How can growing corn in Iowa using industrial agricultural practices contribute to the creation of a dead zone in the Gulf of Mexico? Refer to Figure 4.20.
What will be an ideal response?
Lakes lying in granite basins, such as those in the northeastern United States, tend to become acidified by acid rain more readily than lakes lying in limestone basins, such as those found in the midwestern United States. Why is this so?
A. The limestone, which is calcium carbonate, serves to neutralize the acid in the rain. B. There is more acid rain in the northeast than in the midwestern regions of the United States. C. The granite contains acidic minerals that dissolve in the rain water and are added to the lakes. D. Since the acidified water cannot percolate through the granite, the acid in the lakes becomes more concentrated.
What makes light absorption in diatoms more effective than just using chlorophyll?
A) Surface-to-volume B) Microbial loop C) Frustule perforations D) Accessory pigments
Outline the four steps of risk assessment used by the EPA
What will be an ideal response?