Question

which agent of erosion can usually move only sand - sized or smaller particles?
wind
landslides
glaciers
water

Explanation:

Wind is a relatively weak agent of erosion compared to landslides, glaciers, and water. Landslides can move large boulders and massive amounts of soil. Glaciers can transport huge rocks (erratics) as they move. Water, in the form of rivers, can carry a wide range of particle sizes including large sediments during floods. Wind, however, typically can only move sand - sized or smaller particles. It can create sand dunes by moving sand grains, but larger particles are too heavy for the wind to lift and transport over long distances.

Answer:

wind