Which of the following statements describes the air motions beneath and between fair-weather cumulus (cumulus humilis) clouds?
A. Downdrafts occur beneath them, and updrafts occur between them.
B. Updrafts occur beneath them, and horizontal motions occur between them.
C. Downdrafts occur beneath them, and horizontal motions occur between them.
D. Updrafts occur beneath them, and downdrafts occur between them.
Answer: D
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Which of the following is the major concern about climate change if CO2 levels in the atmosphere exceed 450 ppm?
A. the effects would be irreversible B. the earth would erupt into a huge fireball C. all life on the planet would die D. some oil companies will go out of business
Which one of the following statements about polar bears is not true?
a. In 2008, the U.S. Fish and Wildlife Service placed the Alaskan polar bear on its list of threatened species. b. Alaskan state government officials are trying to have the polar bear delisted. c. Polar bear populations are a significant threat to wolf populations in Alaska d. Oil and coal industry leaders want the polar bear delisted in Alaska e. Less than 60% of the world population of polar bears lives in Alaska
The rotting of rock by the various types of chemical weathering takes place best in ______.
a - upland montane forests b - humid regions c - polar regions d - limestone regions e - arid lands
In winter, freezing water can break pipes and even crack engine blocks.Why does this happen?
A) Water expands in volume as it freezes. B) Ice is denser than water. C) Water contracts as it cools and freezes. D) It occurs because of the latent heat of fusion.