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Extensive farming combined with severe drought caused the Dust Bowl in the 1930s. Deep plowing on the Great Plains killed the natural grasses that kept soil in place, and the topsoil turned to dust and blew away.
A: The Dust Bowl lasted about a decade, beginning in 1930 and lasting until 1940. The lack of grasses and waves of drought during those years resulted in the topsoil being blown away during strong winds, creating massive dust storms.