Question

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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Answer 1

Millions of acres of productive farmland became barren desert.

Answer 2

The logical continuation of this chain would be:

Millions of acres of productive farmland became barren desert.

Without grass, the land had no protection from he winds, which blew away the fertile topsoil. And resultedly, we receive a deserted area, with no plants growing there.