Now consider water in a crack in a boulder. It freezes, and the crack widens.

Water in a crack freezes, and the crack widens. The rock broke where it sits: weathering.

The rock broke where it sits. So this is weathering.

Now consider flood water rushing over a field and taking the soil with it.

Flood water rushes over a field. The pieces were carried away: erosion.

The pieces were carried away. So this is erosion.

Now consider mud in a slow river, settling on the inside of a bend.

Mud settles on the inside of the river's bend. The pieces were dropped: deposition.

The pieces were dropped in a new place. So this is deposition.

Now consider a root growing into a sidewalk slab and splitting it.

A root splits a slab. The rock broke where it sits: weathering.

The rock broke where it sits. So this is weathering.

The one question, and the three answers.