The Huge Dust Storms That Took Place in the U

Multiple Choice

The huge dust storms that took place in the U.S. Midwest in the 1930s _________________.

A) were triggered by tornados, worsened by global climate change
B) were the result of glacier melt
C) were the result of ozone depletion
D) were the result of polar cells
E) were the result of poor farming and grazing techniques