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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.
The climate was an important cause of the dust bowl. The climate of the Great Plain's region is dry and windy; winds reached the speed of 60mph. Scientists believed that drought which caused the dust bowl to take place occurred because it happened same time as La Nina event in the Pacific Ocean.