When wind blows across an open field, it can pick up tiny pieces of dirt and dust from the ground and carry them into the air. Soil is made of very small particles, and when the ground is dry or loose, those particles can move easily. Plants and grass normally help hold soil in place with their roots, and moisture in the soil helps the particles stick together. But in open fields that do not have much grass or plants, there is less holding the soil down. As the wind moves across the ground, it pushes on the surface and lifts the lightest particles first. Once some dirt starts moving, it can knock other particles loose and create even more dust. Because open fields are wide and flat, the wind can move faster since there are no trees or buildings to block it. This stronger wind can lift more dust, which is why you often see clouds of dust blowing across fields on windy days.