Question: what are the organic and inorganic constituents of soil?
Answer: Humus, the organic material in soil, is composed of microorganisms (dead and alive) and decaying plants. The inorganic material of soil is composed of rock, which is broken down into small particles of sand (0.1 to 2 mm), silt (0.002 to 0.1 mm), and clay (less than 0.002 mm).