Bwakins901
Answered

which of the following was a cause of the ecological disaster known as the dust dawn

AA massive earthquake that loosened the topsoil
BA flood in California

C.The plowing under the native grasses that kept topsoil in place

DExcessive rainfalls that year

Verified Answer :

Timmeh

Hi, Bawkins

The answer is C.  The many dust storms that occurred during the dust bowl era was caused by poor farming techniques, that removed essential grasses and other plants, causing the topsoil to become loose.  Also, natural drought played a role in it too.

-Hope this helps!

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