Soil and Rocks: Soil Layers

The video tutorial explains the different layers of soil observed when digging a hole. It highlights two main layers: topsoil and subsoil. Topsoil is rich in humus, which consists of decaying plant and animal matter, providing essential nutrients for plant growth. The depth of topsoil can vary significantly. Below the topsoil is the subsoil, which is lighter in color and lacks humus. Beneath the subsoil lies the bedrock, a solid rock layer.

What might you notice if you dig a hole in the ground?

• Just water

• Multiple layers of soil

• Only rocks

• A single layer of soil

What is the dark top layer of soil called?

• Bedrock

• Subsoil

• Topsoil

• Clay

What is humus primarily composed of?

• Dead plants and animals

• Water

• Minerals

• Sand

Which layer of soil is usually lighter in color?

• Clay

• Bedrock

• Subsoil

• Topsoil

What lies beneath the subsoil layer?

• Topsoil

• Humus

• Bedrock

• Sand