Soil Layers and Composition

The video tutorial explains the five layers of soil: organic layer, topsoil, subsoil, parent material, and bedrock. Each layer is described in terms of its composition and role in soil fertility and plant growth. The organic layer, or o-horizon, is rich in decomposed plant material, while the topsoil, or a-horizon, supports plant life. The subsoil, or b-horizon, is compact and supports long roots. The parent material, or c-horizon, consists of large rocks, and the bedrock is the solid rock foundation.

What is the organic layer of soil also known as?

• a-horizon

• c-horizon

• b-horizon

• o-horizon

Which layer of soil is primarily responsible for plant growth?

• Parent Material

• Subsoil

• Topsoil

• Bedrock

What is the subsoil layer also referred to as?

• o-horizon

• b-horizon

• c-horizon

• a-horizon

Which layer of soil consists of large rocks and is known as the c-horizon?

• Organic Layer

• Bedrock

• Parent Material

• Topsoil

What is the main composition of the bedrock layer?

• Clay and minerals

• Organic matter

• Solid rocks

• Decomposed plant remains

Which layer is the hardest and forms the foundation of the soil structure?

• Parent Material

• Subsoil

• Topsoil

• Bedrock