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diatomaceous earth


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(kieselguhr)

A deposit composed of fossil diatoms, which is mined for many industrial uses: as a mild abrasive in metal polishes, as a filtering medium (e.g. in sugar refineries), for insulation of boilers and blast furnaces, etc. Vast deposits of diatomaceous earth are mined at Lompoc, California.

Subjects: Biological Sciences.


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