The correct answers are A, B and C. The natural causes of the Dust Bowl were light soil, erosion and droughts.
Explanation:
The Dust Bowl was a period of drought and dust storms on the prairie plains of Canada and the United States in the 1930s, especially between 1934 and 1936. The phenomenon was caused by extreme drought and decades of intensive farming without crop rotation or other techniques to prevent wind erosion. By plowing too deeply, the natural grass growth, which normally holds the soil together and retains moisture, had come loose, causing the top soil layer to dry out. The upper layer was blown away by storms; in some cases, fine dust reached cities such as Chicago, New York and Boston. The Dust Bowl caused enormous damage to both agriculture and the environment.
