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Boson
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Astronautics
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Earth-grazing asteroid
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Arsenic
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Myelin
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Silver birch
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Geode
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Cardia
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Occultation
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Magma chamber
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IFREMER
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Gene amplification
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Dwarfism
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Allosaurus
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Router
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Z-Machine
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Oakley
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Cilia
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Agglutination
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Cloaca
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Hydrogeology
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Data stream encryption
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Ammonia
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Alula
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Julian year
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The Bohr magneton
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Rowan
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Falconiformes
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Age pyramid
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Blandford-Znajek mechanism
Chronic pollution
Chronic pollution is permanent pollution caused either by repeated or continuous emissions of pollutants, or the presence of very persistent pollutants.
Known or predictable, this type of pollution may vary widely over time.
Chronic pollution of the Aa between 1985 and 1995 from paper mills, factories and urban centres. © F. Lamiot, Wikimedia CC by-sa 3.0
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