Materials made of very small grains of minerals.

The breakdown of rocks into small pieces from wind, water and ice.

To rot or break down into small parts.

Small pieces of rock.

Rocks that from when sediments are pressed together.

Soil rich in nutrients that is good for plant growth.

A material made up of tiny pieces of weathered rock.

The size of soil particles

Decaying plant and animals in the soil.

A mark made by pressure.