Here is the completed soil horizon table:
Layer name Horizon name
Organic layer 1. Horizon O
Top soil 2. Horizon A
Sub soil 3. Horizon B
4.Weathered rock particles 4. Horizon C
Bed rock 5. Horizon R
The soil horizon names are:
O horizon: This is the organic layer consisting of accumulating plant litter and decomposing organic matter.
A horizon: This is the top soil consisting of mineral material mixed with organic matter. It has the highest concentration of organic matter.
B horizon: This is the subsoil consisting of predominantly mineral material. It has less organic matter than the A horizon.
C horizon: This consists of weathered bedrock with accumulated mineral material. It contains few organic materials.
R horizon: This is the unweathered bedrock material beneath the soil layers.
So each soil layer is named according to its composition and properties using horizon names from O to R