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Because the A horizon contains more humus which makes the A horizon more organic
b horizon
no it is found in the topsoil or a horizon
A horizon B horizon C horizon O horizon
The O-Horizon
A horizon
soils have different layers present in it as the depth increases. These layers are called horizons. Humus as we all know is present in the top layer of the soil,which is several inches in thickness and is called A horizon.
organic
The C and R horizon
The C horizon contains mainly parent material, while the B horizon contains mainly clay particles and the A horizon; mainly silt sized particles and humus
The Fertile soil contains lots of microorganisms which decompose the complex dead bodies of animals and plants into simpler substance called Humus.
The A horizon is the top layer and is made out of sand, clay silt, and humus. It is where most plants grow. =-) Hope that helped.