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Pigmentary
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Cryogenian
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Oxidation
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Magnetic monopole
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Brinelling
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Abzyme
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Quantizing
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Biogenic amine
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Rootlet
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Bronchitis
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Thruster
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Gametangium
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Terrestrial planet
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Prime number
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Cross-talk
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Microclimate
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Venera
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Glycolipid
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Porphyry copper
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Appulse
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Google Earth
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Facet
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Spar
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Prompt
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Giant sequoia
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Hypernova
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Digital
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Symbiosis
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Carpus
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Crystal chemistry
Radon
Radon is a radioactive gas produced in a natural nuclear reaction. Its concentration varies with the nature of the soil and weather conditions.
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