Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: 
The Dust Bowl taught people that soil could be lost by plowing and growing crops. This led to the development of new ways of farming that help protect the soil. Some of the methods are described in Figure below .


Question: What historical event taught people that soil could be lost by plowing and growing crops and encouraged new methods to prevent erosion?
the dust bowl
The Dust Bowl.