It is easier to dig soil initially because the upper layer of the soil consists of topsoil and subsoil. These two horizons are composed of loose soil particles and easy to dig. At the deeper layers, partially weathered rocks or bedrocks are present. It is very difficult to dig through partially weathered rocks or bedrocks.At deeper layers, partially weathered rocks or bedrocks are present which are hard, making digging difficult.
The different layers of soil are:
- Parent rock
The soil profiles are composed of a series of horizons or layers of soil, which are stacked one above the other. The 4 horizons of soil are:
- The O-Horizon.
- The A-Horizon.
- The B-Horizon.
- The C-Horizon.