There were two main causes that created the Dust Bowl of the 1930s. First, there was a drought that lasted several years, but that alone did not cause the Dust Bowl. In addition to the lack of precipitation were the farming techniques used at the time. Today, farmers rotate crops. This means they will plant one type of crop for a few years, which will eventually deplete the soil. Farmers will then allow the soil and nutrients to rebuild by not farming on that land for another year or two, or by changing the crop, thereby "rotating". Farmers in the 20s and 30s did not rotate crops. Instead, they planted on the land until it the top layer of soil (top soil) was completely depleted, along with most of the nutrients. Basically, they farmed the land to death, and eroded away the top layers. Draught, windy conditions, and the leftover dust created the horrendous time period in our history called The Dust Bowl.