Which of the following contributed to the dust bowl in the American southwest during the 1930s?

I) overgrazing by cattle
II) clear-cutting of forest trees
III) plowing of native grasses
IV) lack of soil moisture
A) I and II
B) II, III, and IV
C) I, III, and IV
D) I, II, III, IV


Answer: C

Biology & Microbiology

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