Look at the statements below about the 1930s. Loss of grasses left topsoil loose and unprotected.
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High winds frequently blew on the Great Plains.
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Valuable topsoil needed by farmers was thus blown away.
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Which statement belongs on the blank line?
On farms, crops were not rotated, and soil nutrients were used up.
Farm production harmed fertile land.
Millions of acres of productive farmland became barren desert.
On ranches, herds overgrazed and damaged grasses.