Fossil shell flour, or diatomaceous earth, is a flour made of diatoms, which are hard-shelled algae. Diatoms are food for virtually all forms of aquatic life.
Fossil shell fuels are also beneficial for humans. When the powder is ingested, it drives toxins and bacteria out of the body. The substance is also used to strengthen the hair and nails. It is a natural insecticide and is used to keep fleas and cockroaches from infesting homes and gardens. Fossil shell fuel can be used to enrich soil and does not harm earthworms. Earthworm farmers even use the substance to keep worm beds free of bacteria.