Soil Review

SOIL LAYERS ARE CALLED.......

• MATERIALS
• ORGANIC
• HUMUS
• HORIZONS

THIS LAYER CONTAINS UNWEATHERED SOLID ROCK AND IS BENEATH ALL OTHER LAYERS......

• HORIZON A

• HORIZON O

• HORIZON R

• HORIZON C

THIS HORIZON IS MADE OF DECAYING LEAVES, TWIGS AND ANIMAL REMAINS/WASTES......

• A
• B
• C
• O

MIXTURE OF ROCK, MINERAL PARTICLES, AND ORGANIC MATTER...... 

• HORIZONS
• HUMUS
• SOIL
• CLAY

What is the name of Horizon 1?

• Subsoil 
• Topsoil
• Bedrock 
• Parent Rock

What is the name of Horizon 2?

• Subsoil 
• Topsoil
• Bedrock 
• Parent Rock

Soil formation begins with the weathering of 

• litter.
• bedrock.
• the A horizon.
• humus.

What is humus?

• soil
• organic matter
• loam
• minerals

Which layer is the subsoil?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

• Horizon R

The horizon that contains partially weathered rock.

• C Horizon

• A Horizon

• B Horizon

• Bedrock