The part of the subsurface where most of the pore spaces are filled with air is the
A. aquifer.
B. unsaturated zone.
C. saturated zone.
Answer: B
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Which of the following statements regarding migration and settlement of African Americans in the United States is most accurate?
A) In 1900, about half of African Americans lived in the South; today that figure remains the same. B) In 1900, more than 70% of African Americans lived in the South; today about one-third of them live there. C) In 1900, more than 90% of African Americans lived in the South; today a little more than half of them live there. D) In 1900, about half of African Americans lived in the South; today about 90% of them live there. E) In 1900, more than 90% of African Americans lived in the South; today that figure remains the same.
Which of the following describes the relation on an upper-level chart between air temperature and pressure?
A. Warm air aloft is associated with constant pressure surfaces that are found at higher altitude than normal and lower than normal atmospheric pressure aloft. B. Warm air aloft is associated with constant pressure surfaces that are found at lower altitude than normal and lower than normal atmospheric pressure aloft. lower; lower C. Warm air aloft is associated with constant pressure surfaces that are found at higher altitude than normal and higher than normal atmospheric pressure aloft. D. Warm air aloft is associated with constant pressure surfaces that are found at lower altitude than normal and higher than normal atmospheric pressure aloft.
The formation of sleet involves
A. air temperatures decreasing uniformly with height, producing the cold conditions necessary for freezing rain formation. B. snow passing through a layer of above freezing air, melting, and then refreezing, forming a pellet that bounces when reaching the surface. C. snow passing through a layer of freezing air forming a glaze of ice when reaching the surface. D. air temperatures increasing uniformly with height, producing the cold conditions necessary for freezing rain formation.
In the I=PAT model, how does technology relate to environmental impact?
A) Environmental impact usually decreases a country's ability to develop new technologies. B) Environmental impact decreases with increased technology. C) Environmental impact increases with increased technology. D) Environmental impact may increase or decrease with increased technology, depending on how technology is being used.