The youngest event represented in this block diagram is
A. erosion of a canyon by a river.
B. formation of the lowest layer.
C. retreat of the seas.
D. deposition of the top layer.
Answer: A
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This is the most abundant primary pollutant
A) nitrogen oxide B) carbon monoxide C) lead D) sulfur dioxide
The three stable (i.e., nonvariable) gases in the atmosphere, in order of abundance from most to least, are
A) carbon dioxide, argon, oxygen. B) oxygen, carbon dioxide, argon. C) nitrogen, oxygen, argon. D) oxygen, argon, nitrogen.
Plants or animals that people have introduced to a place that is not their native environment, where they outcompete native species and reproduce in great numbers, are called ____
a. xerophytes b. invasive exotic species c. omnivores d. epiphytes e. specialists
Continental polar air masses seldom influence the weather south of the Great Lakes
Indicate whether the statement is true or false