In response to the Dust Bowl, employees of the U.S Forestry Service, the Civilian Conservation Corps (CCC), and the Works Progress Administration (WPA) planted nearly 220 million trees on approximately 30,000 farms in the Great Plains during the 1930s. What was the purpose of this effort?

A.
to prevent wind from eroding the soil
B.
to grow timber for houses and barns
C.
to mark property lines between farms
D.
to provide shade for farm workers

A. to prevent wind from eroding the soil