Which human activity had the biggest impact on dust storms in 1930 a. diverting rivers and streams b. using industrial pollutants c. replacing natural grasses with crops d. settling in new areas

ANSWER:

Replacing natural grasses with crops had the biggest impact on dust storms in 1930.

EXPLANATION:

answer; i believe that one of the correct answers is preventing human development;

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.