单词	diatomaceous earth
释义	diatomaceous earth /ˌdʌɪətəˈmeɪʃəs / noun [mass noun] A soft, crumbly, porous sedimentary deposit formed from the fossil remains of diatoms.Diatoms have an extensive fossil record going back to the Cretaceous; some rocks are formed almost entirely of fossil diatoms, and are known as diatomite or diatomaceous earth.... The richest sources of diatom fossils are deposits of their skeletons known as diatomite, or diatomaceous earth. As the diatoms die, they sink to the ocean floor, becoming a thick ooze of decomposing matter, and eventually giving rise to deposits of the sediment called diatomaceous earth.
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