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Diatomaceous earth (/ˌdaɪ.ətəˈmeɪʃəs/ DY-ə-tə-MAY-...

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Boron is a chemical element. It has the symbol B a...

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Silicon dioxide, also known as silica, is an oxide...

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Calcium nitrate are inorganic compounds with the f...

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Spectrophotometry is a branch of electromagnetic s...

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Sulfur (also spelled sulphur in British English) i...

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An alum (/ˈæləm/) is a type of chemical compound, ...

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The western desert of Egypt was a major source of ...

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