"Glaciers have no defined cleavage planes, but instead flow plastically." Evaluate this statement
A) This statement is true, but it only applies to the upper part of a glacier.
B) This statement is false. Ice has cleavage similar to the mineral mica, and ice behaves like mica would under the same pressure.
C) This statement is partially true. The flow of glaciers is very slow and more similar to gravel than to plastic.
D) This statement is false. Glaciers do flow plastically, but also have well-defined cleavage planes similar to mica.
Answer: D
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When a dam and reservoir are constructed, the natural response of the river and its channel gradient come under the control of
A) the same base level that existed prior to construction. B) those of the closest nearby natural lake. C) the government. D) a local, or temporary, base level. E) an ultimate base level.
Soil erosion is only an agricultural problem.
Answer the following statement true (T) or false (F)
Which of the following elements is omitted from the calculations that produce the rate of natural increase?
A) number of live births B) number of deaths C) migration D) division by population to produce a percentage value E) population of a country
The sudden rapid movement of an unsaturated cohesive mass of regolith or bedrock is a
A) mudflow. B) creep. C) debris avalanche. D) rockfall. E) landslide.