Grade 4, Science Olympiad (CBSE) - Layers of soil
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Grade 4 | Science | Layers of soil, Our Environment, Olympiad, CBSE, ICSE, Maths Olympiad, Science Olympiad, English Olympiad
Layers of soil
Following are the 5 layers of soil:
The topmost layer of soil is called humus. Humus is the organic matter which is made up of dead plants and animals. Humus is very fertile and helps plants to grow. Humus is dark brown or black in color.
Topsoil is below humus. It is very fertile and contains microorganism. It is rich in minerals.
The subsoil is below the topsoil. It is the home of earthworms.
Small rocks are weathered rocks below subsoil. Roots of very few trees reach up to this layer.
Bedrock is the bed of newly formed rocks. These rocks are big.
Actual layers of soil
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