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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.
dust bowl (noun) a region subject to dust storms; especially the central region of United States subject to dust storms in the 1930s Freebase (0.00 / 0 votes) Rate this definition: Dust Bowl. The Dust Bowl, or the Dirty Thirties, was a period of severe dust storms causing major ecological and agricultural damage to American and Canadian prairie lands in the 1930s. The phenomenon was caused by severe drought combined with a failure to apply dryland farming methods to prevent wind erosion.