Soil Layers and Soil Evolution

Layers of soil are also known as:

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

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

• clay
• sand
• silt
• mud

Which of the following is the largest particle in soil?

• sand
• silt
• humus
• clay

The layer of soil which the topsoil is found.

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

In which layer of the soil profile contains the MOST humus?

• Layer 1
• Layer 2
• Layer 3
• Layer 4

What is the name of Soil Horizon B?

• Subsoil
• Topsoil
• Bedrock
• Transition Zone

Soil is formed slowly through the weathering of materials called ___.

• Bedrock or parent material
• Magma and lava
• organic matter
• leaves and litter

What are the two types of weathering?

• Rain and Snow
• Precipitation and Temperature
• Physical and Chemical
• Metal and Nonmetal

Large rocks fall from mountainsides

• Chemical weathering
• Mechanical weathering

Name that layer!

Layer where soil accumulates (holds) nutrients such as nitrogen and phosphorus because roots extend into this layer

• Topsoil

• Subsoil

• Bedrock

• Transition Zone