Will grains of sand or pebbles move the quickest?

Grains of sand typically move quicker than pebbles due to their smaller size and lighter weight, which allows them to be easily lifted and carried by wind or water. In environments like beaches or deserts, sand can be shifted rapidly by the forces of nature, while pebbles, being larger and heavier, tend to remain in place or move more slowly. Thus, in general conditions, grains of sand will move quicker than pebbles.