Types of farming include subsistence farming, mixed farming, nomadic herding, commercial plantation, livestock rearing, etc.
Some people call scree talus which is smaller rocks broken from bigger ones which are extremely slippery. Talus also known as boulders are also slippery. You can fall between them, lodged between two of them, twist ankles, break bones. You have to be strong to hop these types of boulders.
It was based on many years of survey information from several sources and was called “Soil Classification - a Binomial System for South Africa”, known as the “red book”. It uses unique combinations of topsoil and subsoil horizons (layers) to place a soil into a specific soil form.