The final colloidal remains of bulky organic matter in the soil – holds plant foods and water and is the major soil glue, thus creating soil structure.

Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. … In addition to the plant material in leaf litter, humus is composed of decaying animals, such as insects, and other organisms. humus is not actually type of soil, but is rather a form of mature compost. It can be made either through a composting process or can be found in nature, …`