Soil Composition/Soil Profile

Which layer is the parent material?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

• Horizon R

Which of the following is NOT one of the three types of soil?

• clay
• sand
• silt
• mud

The horizon is called the subsoil, usually consist of clay and other particles leached down from the A Horizon

• B Horizon
• A Horizon
• Erosion
• Bedrock

Layers of soil are also known as:

• Soil Profiles
• Soil Horizons
• Soil sheets
• Soil cores

Which of the horizons in the soil profile shown represent the organic material?

• Horizon O (Humus)
• Horizon A
• Horizon B
• Horizon C

Which layer is the subsoil?

• Horizon O

• Horizon A

• Horizon B

• Horizon C

• Horizon R

Which of the following orders sediment particle size from smallest to largest?

• silt, sand, clay
• sand, silt, clay
• clay, sand, silt
• clay, silt, sand

The horizon contains partly weathered rock

• C Horizon
• A Horizon
• B Horizon
• Bedrock

Soil formation begins with the weathering of 

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

What is humus?

• soil
• organic matter
• loam
• minerals