Which of the statements below is the best explanation for the pattern of diffusion shown in the maps?
A) Early migrants were reluctant to move into the countryside since the city was all they knew.
B) African Americans first migrated to neighborhoods where other African Americans lived.
C) Baltimore passed a law in 1940 allowing African Americans to migrate.
D) Growth resulted from natural increase in the African American population.
E) Baltimore was the destination of large numbers of refugees.
Answer: B
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The lithosphere refers to the
A) plasticky interior of the Earth that moves in response to heating from the interior. B) molten lava that is ejected from volcanoes. C) land part of the Earth only. D) solid upper part of the Earth, including the crust and uppermost mantle.
What percentage of all antibiotics used in the United States are added to animal feed?
A. 20% B. 40% C. 50% D. 60% E. 80%
The next large earthquake on the San Andreas Fault zone in California is considered likely to be ________
A) in northern California because the last major earthquake was in central California and the plate boundary is moving the stress to the northwest. B) in Southern California because it has been nearly 300 years since the last major earthquake in that area C) in San Francisco because large earthquakes there are thought to occur every 75 years and the last large earthquake was in 1906 D) All of the fault system is considered equally likely because the plate motion is uniform and all areas are affected equally.
The most important function of the ozone layer in the stratosphere is
A. conversion of oxygen to O3. B. absorption of incoming UV radiation from the sun, that otherwise would increase the risk of skin cancer. C. maintenance of the Earth's magnetic field. D. destruction of CFCs, that otherwise would accumulate in the atmosphere and cause increased incidence of lung cancer.