Vocabulary terms from the Introduction to the Atmosphere Notes
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| atmosphere | layer of gases that surrounds a planet
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| nitrogen | makes up 78% of dry air
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| oxygen | makes up 21% of dry air
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| water vapor | water in the form of a gas
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| pollen and volcanic ash | examples of natural sources of pollution
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| pollutants | harmful substances found in the air, in water or on land
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| trace gases | gases found in very small quantities in the atmosphere
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| hydrogen and helium | examples of trace gases
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| Ozone Alert Day | day when high levels of ground level ozone are expected
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| acid rain | precipitation that contains sulfuric and nitric acid
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| three | number of oxygen atoms in an ozone molecule
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| hot and sunny | weather conditions that increase ozone production
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| ground-level ozone | "bad ozone"
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| photochemical smog | occurs when sunlight reacts with certain chemicals to form ground level ozone
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| colorless, tasteless and odorless | 3 characteristics of ozone
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