Which of the following was a cause of the ecological disaster know as the dust bowl? a. excessive rainfall that yearb. the plowing under of native grasses that kept topsoilc. a massive earthquake that lossened the topsild. a floor in california

 B. The plowing under of native grasses that kept topsoil
The Dust Bowl was caused by poor agricultural practices where in the post World War I recession, the farmers were led to try new farming techniques to increase profits. But plow-based farming in the region raised unexpected return which is the loss of fertile topsoil that leaves the land susceptible to drought and hostile for growing crops.

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