Understanding Soil Horizons

The video explains the concept of soil horizons, which are layers that form in soil over time. It describes the three main horizons: A, B, and C. The A horizon, or topsoil, is rich in nutrients and humus. The B horizon, or subsoil, is lighter and contains fewer nutrients, with minerals leaching into it. The C horizon consists of partially weathered rock, similar to the underlying bedrock. The video concludes by noting that soil profiles vary greatly depending on location.

What is a soil profile?

• A cross-sectional view of soil layers

• A method of soil cultivation

• A type of soil erosion

• A type of plant root

Which horizon is known for being nutrient-rich and dark-colored?

• A horizon

• D horizon

• C horizon

• B horizon

What is another name for the A horizon?

• Topsoil

• Leaching layer

• Bedrock

• Subsoil

Which horizon is characterized by partially weathered rock?

• A horizon

• B horizon

• C horizon

• D horizon

What process involves minerals washing into the B horizon?

• Compaction

• Weathering

• Leaching

• Erosion