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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.
Answer by Nightrideproductions. Confidence votes 483. A dust storm is usually caused by the top layer of earth becoming very dry over time, usually from a drought. When the wind becomes heavy enough, it will pick up only the smallest particles of dirt, which resembles dust, and will carry them through the air.