The Dust Bowl in the United States in the 1930s was caused primarily by
A) planting grains in soils that could support only leaf crops sustainably.
B) lack of any soil conservation practices, continuous cropping, coupled with natural drought.
C) lack of enforcement of the soil conservation provisions of the 1862 Homestead Act.
D) attempts to farm areas with desert-like climate and thin topsoil.
B
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