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Chott
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Bonding
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Precession-nutation
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Catalase
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Beta lactam
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Abortion
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Phobos-Grunt
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Flocculation
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Sputnik
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Star
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Kyphosis
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Incursion
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Diploid
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Anterior
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Sulforaphane
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Tectrix
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Perl
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Allotropy
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Google Bombing
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Eclipse of the Moon
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Protandrous
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Polylactic acid
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Macrolide
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Empyema
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Antibiotic
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Riparian forest
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Active galaxy nucleus
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Crinoids
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Platelet
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xDSL
Quartz sand
Quartz sand when used in a filter, intercepts all of the particles suspended in water. Filtration through a bed of quartz sand is a practice widely used in waste water treatment installations. Found in compact form as sandstone, quartz sand is also one of the main ingredients in ceramics.
Ceramics are composed of quartz sand. © Vassil, Wikipedia, public domain
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