Question

look at the statements below about the 1930s. loss of grasses left topsoil loose and unprotected. high winds frequently blew on the great plains. valuable topsoil needed by farmers was thus blown away. 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.

Explanation:

The first three statements describe a chain of events leading to soil loss. The next logical consequence of topsoil being blown away would be the transformation of farmland. The other options either introduce new causes (like crop rotation or overgrazing) or are too general (farm production harmed fertile land). "Millions of acres of productive farmland became barren desert" directly follows the topsoil - loss scenario.

Answer:

Millions of acres of productive farmland became barren desert.