Absorption of 1.0 rad of which of the following types of radiation will result in the greatest tissue damage?
A) a
B) b
C) l
D) None, they all result in the same amount of damage.
A
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When a wave train moves toward shore, the swell "feels" bottom when the water is shallower than ____ the
wavelength. a. one-sixteenth b. one-eighth c. one-quarter d. one-half e. three-quarters
The most cleanly burning fossil fuel available that produces the least pollutants is
A) coal, usually found in deposits deep within the Earth. B) kerosene, found in deposits associated with oil wells. C) natural gas, usually found in deposits associated with oil. D) nuclear energy, produced from rocks and minerals within the Earth.
What percentage of the world's freshwater is used for agriculture?
A) 10 B) 50 C) 70 D) 40 E) 80
What are pastoralists?
A) herders B) farmers C) traveling merchants D) missionaries E) none of the above