Unit 5 Test Review

In which horizon is most of the HUMUS?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

SOIL LAYERS ARE CALLED.......

• MATERIALS
• ORGANIC
• HUMUS
• HORIZONS

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

• A
• B
• C
• O

SLIGHTLY BROKEN UP ROCK.....

• C
• D
• O
• A

WHAT IS HORIZON C ALSO CALLED.......

• HUMUS

• BEDROCK

• ORGANIC MATTER

• INORGANIC MATTER

WHAT LAYER IS TOPSOIL FOUND IN........

• A
• B
• C
• D

What is the layer of soil that contains the roots of the big trees?

• Organic

• Topsoil

• Subsoil

• Bedrock

Which layer is the bottom of the soil profile?

• Partially Weathered Parent Material

• Separated rock

• Bedrock

• Topsoil

Soil is made of?

• weathered rocks and minerals

• dead plants and animals

• air and water

• all of the above

What is humus?

• soil
• organic matter
• loam
• minerals