Here's why:

* Erosion is the process of wearing away and transporting rock material. This can be caused by wind, water, ice, or even plant roots.

* Sediment is the broken-down rock fragments that result from erosion. These fragments come in various sizes, from tiny particles of sand to large boulders.

So, when you see sand on a beach, pebbles in a stream, or even dust blowing in the wind, you're actually looking at sediment—the products of rock erosion.