Question

How is humus formed ?

Answer 1

Humus is formed when organic material (such as leaves, dead animals etc.) is degraded by a combination of fungi, bacteria , microbes and other animals (earthworms for example) that reside in the soil

Answer 2

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.