Soil Grade

SOIL LAYERS ARE CALLED.......

• MATERIALS
• ORGANIC
• HUMUS
• HORIZONS

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

• A
• B
• C
• O

RICH IN MINERALS, SUCH AS IRON AND ALUMINUM (it is under E if there is one)

• O
• A
• B
• D

WHAT IS HORIZON R ALSO CALLED.......

• HUMUS
• BEDROCK
• ORGANIC MATTER
• INORGANIC MATTER

What is the name of a soil that is:
30% Sand
10% Silt
60% Clay

• Clay
• Silt loam
• sand
• Sandy loam

What is the name of a soil that is:
85% Sand
10% Silt
5% Clay

• Sand
• Silt loam
• Loamy sand
• Sandy loam

This is found in the topsoil and is made of decaying plants and animals. 

• dirt
• water
• humus
• subsoil

Breaking down or wearing away of rocks is called....

• weathering
• humus
• erosion 

Out of the following which would contain the most humus?

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

What is the best name of Horizon 4?

• Subsoil 
• Topsoil
• Bedrock 
• Keystone