The western United States has
A) low-density mantle that extends extraordinarily deep.
B) high-density mantle very close to the surface.
C) low-density mantle close to the surface.
D) high-density mantle that extends very deep.
Answer: C
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A. They are sources of naturally occurring gold. B. They hold many clues to Earth's natural history. C. Metals can be efficiently extracted from them. D. They tend to occur in scenic mountainous regions.
During the third Phase of migration to the U.S. (1870-1920), where did the majority of immigrants come from?
A) England and Africa B) Ireland and Germany C) Southern and Eastern Europe D) Canada and Latin America E) Latin America and Asia
Which of the following is NOT responsible for the urban heating effect?
A) Increase in human-made materials that conduct more energy than natural surfaces. B) Increased albedo of urban environments relative to that of natural landscapes. C) The concentration of people, machines and heat generating devices adds more heat to the environment. D) Increased air pollution that absorbs and reradiates heat to surface. E) Heat generated by homes, vehicles, and factories.
Groundwater flows
A. from areas of high hydraulic head to low hydraulic head B. from high elevation to low elevation C. always downhill D. from high permeability to low permeability