Which of the following features characterize wide streams and valleys?
A) rapids; channel bed potholes
B) V-shaped valley cross-sections
C) natural levees; broad floodplains
D) waterfalls; entrenched meanders
Ans: C) natural levees; broad floodplains
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When two tectonic plates converge, one plate is subducted. This means that
A. one plate is forced to slide alongside the other in the same direction. B. one plate is forced to slide alongside the other in the opposite direction. C. one plate is forced over the other. D. one plate is forced beneath the other.
Refuse-derived fuel differs from normal garbage in that it
A. Is sorted B. Has agricultural wastes C. Is selectively collected D. Has coal added E. Is unsorted
The petroleum crises of 1973 and 1979 played a key role in changing the world order created by the U.S. after World War II
Indicate whether the statement is true or false
Excessive growth in aquatic plants and algae is stimulated by:
A. Lack of sunlight B. Abundant supplies of nutrients such as phosphorus C. Cold water D. Lack of nutrients such as phosphorus