Soil Layers/Soil Horizons Review

Front

What are soil layers called?

Back

Horizons

Front

Which layer contains unweathered solid rock and is beneath all other layers?

Back

Horizon R

Front

Which layer is known as the topsoil?

Back

Horizon A

Front

What is the horizon that contains partially weathered rock?

Back

C Horizon

Front

Soil formation begins with the weathering of what material?

Back

Bedrock

Front

What is the top layer of soil that contains organic matter?

Back

Horizon O

Front

Which horizon is typically rich in minerals and nutrients?

Back

Horizon B

Front

What is the process called when rocks break down into smaller particles?

Back

Weathering

Front

What is humus?

Back

Decomposed organic matter in soil.

Front

What is the main component of soil?

Back

Mineral particles, organic matter, water, and air.