Diatomaceous Earth is a naturally occurring soft, sedimentary rock that crumbles easily to a fine white to off-white powder depending on other particles that get mixed in with it during excavation. The typical chemical composition is 80-90 % silica, with 2-4 % alumina, and 0.5 -2 % iron oxide, and other trace elements, making it an inert product. It does not get degraded by microbes or sunlight and will continue to be effective as an insecticide as long as it is dry and not wet. It can be easier to spread over a lawn with a spray gun and water solution but will not be effective till it dries out. It can hold up to 200 times its own weight in water; does not emit vapors and does not dissolve in water, though it is easily mixed with food and water and comes in many different shapes and sizes.