Name the horizon of soil that is rich in humus.

Humus makes the soil more fertile and it provides nutrients to plants.

•  A-horizon- It is dark in colour and is rich in humus and many minerals.
•  B-horizon- It contains less humus, soluble minerals, and organic matter. It is a site of deposition of certain minerals and metal salts such as iron oxide.
• C-horizon-This layer is devoid of any organic matter and is made up of broken bedrock. This layer is also known as saprolite.
•  Bedrock- Bedrock is the common term for solid rock under the surface of the earth.

Hence, A-horizon is rich in humus.