Concept:Soil is a natural mixture of inorganic and organic materials, water, and air.
Explanation:The main components of soil are mineral particles, organic matter, water, and air.
Minerals provide the physical structure of the soil.
Organic matter comes from decomposed plants and animals.
Water and air occupy the pore spaces between soil particles.
Rubber is not naturally found as a component of soil.
It is a product obtained from rubber trees or made synthetically.
Therefore, rubber is the substance that is NOT a normal component of soil.
Answer:C. Rubber