In the 1930s, massive dust storms swept across the central United States, damaging farms and forcing families to flee. Many of these storms were intensified by the land management practices used at the time. Classify each farming practice based on whether it would have intensified or helped prevent the dust storms.
tilling dry soil repeatedly with no moisture,removing natural prairie grasses to expand farmland|using contour ploughing to follow hill shapes,leaving rows of corn stalks in place after harvest