What are the dark areas of the Moon interpreted to be?
A. rocks that are dark and fine-grained because they were smashed by many impacts
B. dark-colored sediment that filled in low areas
C. large areas covered by basalt
D. large areas of the iron-oxide mineral hematite
Answer: C
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Which of the following sites is most likely to be flooded if all other factors are held constant?
A) a site that is higher but closer to the river than a site that is lower but farther from the river B) a site next to the river where the main channel is wider and deeper than other segments of the river C) a site on the floodplain instead of a site on an older terrace D) All of these are correct.
For the same discharge, gradient, and channel cross-section, a stream with a boulder-strewn bed would be more turbulent than one with a sandy bed.
a. true b. false
Instructions: Choose one answer from each pair of selections. Speed CONVERGENCE | DIVERGENCE occurs when the wind slows down as it moves along
If you were to examine the longitudinal profile of a typical river, you would probably find that the gradient is ________
A) steepest near the mouth B) steepest near the headwaters C) roughly the same at the mouth and the headwaters D) steepest in the zone of transport