Worm Web site.
Worms are one of the creatures that can build soil.
While mankind places pressure on our soil resources through poor farming practices, soil erosion, slash and burn practices and other behavior, worms can generously turn organic material into castings that give soil another chance to be fertile. Castings are a mixture of soil and organic material that has passed through a worm's digestive system. It is often found in small piles on the surface of the earth after a rain or in the morning after a worm has returned underground. Castings carry nutrients that are more easily available to plants than conventional composted material. Worms may not seem to have a lot going for them in terms of talent and good looks, but you have to admire their dedication to a dirty job.