Unit 2 - Soil

Topsoil is dark in color because it...

• undergoes a lot of chemical weathering.

• has a large amount of organic material.

• is full of dark rocks.

• contains a lot of worms.

Factors that influence soil formation in a region include:

• average temperature

• amount of rainfall

• type of bedrock

• all of the answers are correct

Horizon A is also known as...

• Top soil

• Bedrock

• Subsoil

• Organic material

The B Horizon is known as

• Parent Rock

• Top soil

• Bedrock

• Subsoil

The C Horizon is known as

• Top soil

• Organic material

• Parent Bedrock

• Bedrock

A crumbly, dark brown soil that is a mixture of humus, clay, and other materials

• top soil

• sub soil

• organic layer

• bedrock

a dark-colored substance that forms as plant and animal remains decay

• soil

• top soil

• loam

• humus

Soil that is made up of about equal parts of clay, sand, and silt

• organic material

• loam

• humus

• top soil

a layer of soil that differs in color and texture from the layers above or below it

• soil horizons

• soil

• organic matter

• decomposers

the organisms that break down the remains of other dead organisms

• organic matter

• decomposers

• loam

• humus