What is the role of earthworms in soil formation processes?

Earthworms dig the soil, thereby enriching the soil with air. They also help other organisms (for example, bacteria) to multiply (yes, yes, again, thanks to the oxygen in the soil!), And they, in turn, decompose organic matter. Also, the roots of plants also require oxygen.
Earthworms secrete mucus, which sticks together particles of earth, thereby reducing the destruction of the kidney.
By passing humus through their intestines, the worms also fertilize the soil.