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sulfur(51)
carbon(10)
emissions(10)
oxygen(10)
sediments(10)
aerosols(9)
isotopes(8)
absorption(6)
iron(6)
ammonia(5)
carbon dioxide(5)
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x-ray(5)
atmosphere(4)
lakes(4)
minerals(4)
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density(3)
methane(3)
nitrogen oxides(3)
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