What event was a major factor in the development of the fertile soils of the upper Midwest and Northeast United States?

A) glaciation
B) volcanic eruptions
C) tectonic forces
D) erosion by meandering rivers


Answer: A

Environmental & Atmospheric Sciences

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Which of the following gives an example of orographic clouds?

A. clouds forming over a warm ocean current B. clouds formed by surface heating C. clouds forming behind a jet airplane D. clouds forming on the windward slope of a mountain

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In the United States, acid precipitation is least likely to be related to compounds of

A) nitrogen. B) sulfur. C) carbon. D) oxygen.

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