Question

A soil profile with labels O, A, B, C. O: top layer. A: second layer. B: third layer. C: bottom layer. Examine the soil profile and use the drop-down menu to select what each label identifies. Label O Label A Label B Label C.

Answer 1

Label O is organic material, label A is topsoil, label B is subsoil and label C is weathered rock. They represent different soil layers.

Soil layers

Soli layers, also called horizons, refer to the different layers observed on the ground.

The topsoil is a layer of soil composed of a mixture of sand, silt, clay and organic material referred to as humus.

Weathering rocks refer to the dissolved rocks and/or minerals on the Earth's surface.

Subsoil refers to the layer under the topsoil on the surface of the ground.

Learn more about soil layers here:

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