Answer
Both farming and drought
Explanation
Dust worms arise when a gust or a sudden strong rush of wind or other strong winds blows loose sand and dirt from a dry surface. Then Fine particles are transported by saltation and suspension, a process that moves soil from one place and deposits it in another. Generally A dust storm is a meteorological phenomenon common in arid and semi-arid regions which occurs when strong winds lift large amounts of sand and dust from bare, dry soils into the atmosphere
