organic materials - if it means minerals then process is called mining.
The organic material in soil is humus.
Soil is not fabricated...nor is any organic material.
depletion
The organic level which is the uppermost level of the soil.
The decayed organic material in soil is called detrition. This is the broken down results of leaves and other organic substances.
dark soil
dark soil
compost
dark colored soil
Soil is created by worms. Worms eat organic material, and soil, and then they poop out soil.
Decomposing plant material.
soil