Soil layers are called soil horizons. Typically, a soil includes an A horizon, a B horizon and a C horizon. In laymen's terms: A horizon = topsoilB horizon = subsoilC horizon = parent material (the...
topsoilAlso called the A horizon.
Topsoil.
A great soil for gardening
The topsoil is the finest soil layer. Soil 'layers' are called horizons.