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Subsoil.
topsoil.
The C and R horizon
It is substratum because it has little or no moisture and little or no humus.
All soil contains some humus. If it doesn't it is not soil.
the two layers are sub soil The layer of soil that has little or no humus in it is the subsoil. The top layer of the soil has the most humus in it because the dead leaves fall from the plant and go back into the soil.
the O-Horizon is the topmost soil so it has the most humus
The ozone layer contains electrical charged particles that reflects radio waves
inosphere
Humus
The ozone layer contains electrical charged particles that reflects radio waves
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.