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Diatomaceous earth is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white powder, composed of the fossilized remains of diatoms, a type of hard-shelled algae. It is widely used for filtration, as an abrasive, and as a natural insecticide due to its ability to absorb lipids from the waxy outer layer of insects' exoskeletons, causing them to dehydrate.
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