Wind erosion is the correct answer. Explanation: Sandstorms in the Middle East are caused by strong winds blowing over loose soil or sand, and picking up so much of that material that visibility is greatly reduced. This instability mixes strong winds in the middle troposphere downward to the surface, producing stronger winds at the surface.
Sandstorms in the Middle East are caused by strong wind forces blowing over sand. Hence, wind erosion.
A. Wind Erosion
Here's something I found online about wind erosion:
Wind erosion is a natural process that moves soil from one location to another by wind power. ... Wind erosion can be caused by a light wind that rolls soil particles along the surface through to a strong wind that lifts a large volume of soil particles into the air to create dust storms.
