All soil contains some humus. If it doesn't it is not soil.
Soil that contains humus is known as humus soil. Humus is a dark, organic material that forms when plant and animal matter decomposes. Humus soil is rich in nutrients and helps improve soil structure, drainage, and fertility. It is important for healthy plant growth and biodiversity in the soil.
topsoil.
The top layer of soil, called the O horizon or organic layer, contains humus. Humus is a dark, organic material that forms as plant and animal matter decomposes. It is rich in nutrients and helps improve soil structure and fertility.
The layer that contains the most humus and smaller rocks is the topsoil layer. Topsoil is the uppermost layer of soil that is rich in organic matter, such as humus, and contains smaller rock particles that have undergone weathering. It is the most fertile layer of soil and is crucial for plant growth.
humus
The C and R horizon
The Fertile soil contains lots of microorganisms which decompose the complex dead bodies of animals and plants into simpler substance called Humus.
podzolic do not have much fertile humus. this causes a bright brown colour.
3 layers of different kinds of soil is you count humus,5, (humus, topsoil, midsoil, poor soil, bedrock, you can call it 3 though, humus isn't actual soil its dacayed plants and animals)
i am a little primary girl answering this the answer is humus
how does the presence of humus affect soil
The formation of complex organic matter in soil is called Humus