Soil

Which layer of soil is rich in organic material and known as the humus layer?

• C-Horizon

• B-Horizon

• A-Horizon

• O-Horizon

Tags

NGSS.MS-LS2-3

What is the main composition of the O-Horizon?

• Clay soil

• Broken bedrock

• Minerals and metal salts

• Organic materials such as dried leaves and grasses

Which layer is known as the subsoil?

• C-Horizon

• O-Horizon

• B-Horizon

• A-Horizon

What is the primary function of the A-Horizon in soil?

• To store organic material

• To act as a barrier for roots

• To support plant growth with nutrients

• To provide a habitat for microorganisms

Which horizon is also known as the topsoil?

• O-Horizon

• A-Horizon

• B-Horizon

• C-Horizon

Where does soil formation begin?

• Weathering of parent rock.

• Horizon A

• Horizon B

• Soil doesn't form, it's always just been there.

Which horizon contains decomposers so it has the most decayed organic matter?

• Horizon A

• Horizon B

• Horizon C

• Horizon D

Which soil horizon is sometimes called subsoil?

• A

• B

• C

• D

Which horizon contains organic matter?

• R

• O

• E

• B

Layers of soil are also known as:

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