Soil Profile Soil Development Organic Matter

Soil is made of:

• pieces of rock

• air and water

• matter that was once alive

• all of the above

Which layer of soil has low organic material and has clay in the form of aluminum and iron compounds?

• Topsoil

• Bedrock

• Subsoil

Which layer of soil contains lots of roots and minerals for growing plants?

• Topsoil

• Subsoil

• Bedrock

True or False: The layers of soil go in this order: Topsoil, bedrock, subsoil.

• True

• False

Which layer of soil is on bottom?

• Topsoil

• Subsoil

• Bedrock

Identify the soil horizon:
Consists of topsoil (mostly sand and some clay) rich in humus (O horizon) and leached soil deficient in humus and minerals.

• O horizon
• A horizon
• B horizon
• C horizon

Soil horizon is horizontal. Soil profile is vertical?

• true

• false

What is HUMUS made from?

• The remains of decayed plants.

• Both

• The remains of decayed animals.

Which soil layer consists of clay, iron oxides, and other components that came form the zone of leaching?

• E horizon

• A Horizon

• B Horizon

• O Horizon

The light colored, leached horizon.

• A Horizon

• O Horizon

• Bedrock

• E Horizon