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Diatomaceous earth, a powder made from fossilized diatoms, dries out the exoskeletons of roaches.

We made up a song about diatomaceous earth while we were driving in to the post office today, just because we thought it sounded funny.

Flanking the east side of the Rappahannock River in Richmond County, Fones Cliffs reaches 100 feet high in some parts and is a rare spot in the topography of the mid-Atlantic region because of its white diatomaceous earth.

Mixed with diatomaceous earth, a fine powder of algae fossils often used by gardeners, the coarse gray stuff makes a decent substitute for the density and texture of Mars’ dirt.

It suggests diatomaceous earth and commercial rust remover, blended to the consistency of peanut butter.