A mass of ice on land that moves by plastic flow and basalt slip:a
cirque d. outwash
b. glacier e. varve
c. moraine
B
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Coal is composed of
A) petrified wood. B) buried plant material that has partially decayed. C) buried animal material that has partially decayed. D) a combination of oil-rich sediments and calcareous ooze.
You are hiking in the desert. Just when you think you have run out of water, you see a cool spring. As you sip from the spring you are thinking:
A) "I may die from drinking this salt water." B) "Interesting. . . this spring is where the water table meets the land surface." C) "This spring is a clue that rain has recently fallen here." D) "This spring is a source of point pollution."
Where is the most invaded region in terms of exotic species?
a. Los Angeles Harbor b. China c. San Francisco Bay d. Japan
Competitive exclusion is not as common as many biologists expected, in large part because
A) there just are not that many species of organisms on Earth. B) ecosystems are more homogeneous than was appreciated. C) even when two species share an identical niche, they find a way to cooperate. D) subtly heterogeneous environments allow apparent competitors to occupy separate niches.