What are the structures shown in the photo above, and why were they created?

Answer:
Shelter Belts
Explanation:
They protect the soil from erosion, and massive undrainable amounts of rain.
Answer:
Responses may vary but should contain some or all of the following information: These structures are called shelterbelts. They are trees planted in rows, designed to protect farmland from wind erosion. The Civilian Conservation Corps planted windbreaks like this during the Great Depression to reduce the risk of a future Dust Bowl.
Explanation: