Although all compositions are represented, most plutons are:a
felsic rocks.
b. intermediate rocks.
c. mafic rocks.
d. felsic and mafic rocks.
e. felsic, intermediate and mafic rocks.
A
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The Earth continually falls toward the Sun, but doesn't get closer because
A. its tangential velocity causes it to fall around as well as toward the Sun. B. the distance of fall is unattainable. C. gravitation is extremely weak at the Sun-Earth distance. D. all of the above
Which is not a characteristic of thermoclines?
a. Tropical thermoclines are deeper than those at higher latitudes. b. Thermoclines are not identical in form. c. Polar waters tend to lack thermoclines. d. Thermoclines are more abrupt in the high latitudes.
Plants that have developed mechanisms to combat drought are known as:
a. driophytes. b. xerophytes. c. trilobytes. d. trogolodytes.
Haiti is a mountainous island nation that has terrible problems with landslides. Which of the following explanations would best explain the problem?
A) The area is hit by numerous tropical cyclones. B) Most of the forests have been cut down for charcoal, leaving barren slopes subject to mass wasting during heavy tropical rainstorms and earthquakes. C) Climate change has increased weathering rates on the island. D) The corrupt government has made poor roads subject to slope failure.