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

Environmental & Atmospheric Sciences

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The three stable (i.e., nonvariable) gases in the atmosphere, in order of abundance from most to least, are

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Continental polar air masses seldom influence the weather south of the Great Lakes

Indicate whether the statement is true or false

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