Rainshowers:
A) typically come from cumuliform clouds.
B) are, by definition, periods of rain that last for at least one hour.
C) have only one size of raindrop.
D) usually have their origin in orographic lifting.
Answer: A
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El Nino is associated with warmer water currents than normal.
A. True B. False
Although ____________ is the most efficient and sometimes least-costly way to cut trees, it can also harm an ecosystem by causing increased erosion, sediment pollution of nearby waterways, and losses in biodiversity.
Fill in the blank(s) with the appropriate word(s).
Which of the following would NOT increase the resisting forces of a slope?
a. drainage b. loading the toe c. excavation of material at the top of the slope d. ditching to intercept drainage
What proportion of urban Americans lives in the suburbs?
A. one-tenth B. one-quarter C. one-third D. one-half E. two-thirds