Water and living organisms break down rocks

The upper layer of soil, best for plant growth

Tiny particles of soil that hold water and nutrients well

Very small broken pieces of rock. Its particles are larger than clay and smaller than sand.

Small grains of worn-down rock, has few nutrients, and does not hold water well.

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Soil

Term	Definition
Weathering	Water and living organisms break down rocks
Topsoil	The upper layer of soil, best for plant growth
Subsoil	The middle layer of soil
Bedrock	The bottom layer of soil
Humus	Decayed matter in soil
Erosion	The movement of soil
Clay	Tiny particles of soil that hold water and nutrients well
Silt	Very small broken pieces of rock. Its particles are larger than clay and smaller than sand.
Sand	Small grains of worn-down rock, has few nutrients, and does not hold water well.