Which characteristics are most often associated with passing cold fronts? Select all that apply.
- Air becomes cooler after its passing
- Air becomes warmer after its passing
- Cold air forced under warm air
- Decreasing air pressures
- Heavy rainfall upon passage
- Increasing humidity after passing
- Warm air forced under cold air
- Air becomes cooler after its passing
- Cold air forced under warm air
- Heavy rainfall upon passage
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What is the primary source of the CFCs that deplete ozone in the stratosphere?
A. coolants for refrigerators B. ozone from photochemical reactions C. emissions from smelters D. particles from burning the rain forests
When the Sun passes between the Moon and the Earth, we have
A. a lunar eclipse. B. a solar eclipse. C. met our end.
Why is land use planning typically more effective than artificial control of natural hazards?
A) Land use planning often reduces the probability that a hazardous event will occur. B) Most hazardous natural processes are not amenable to artificial control. C) Artificial controls usually increase the probability that a hazardous event will occur. D) Land use planning is an accepted societal tool for hazards, while artificial control is not.
Which of the following is made by chemical processing of animal fat or vegetable oil?
A) Gasoline B) Alcohol C) Sugar cane gas D) Biodiesel E) Ethanol