Air Pollution in Norway
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Understanding air pollution begins with knowing what air consists of. The air is composed of approximately 78% nitrogen and 21% oxygen, plus minute amounts of several other gases: argon, carbon dioxide, neon, methane, helium, krypton, hydrogen, and xenon (Lide, 1997). The earthÆs atmosphere is composed of four layers: the troposphere, stratosphere, mesosphere, and thermosphere. The troposphere, the densest layer of atmosphere, starts at the earthÆs surface and extends upwards 5-9 miles. The troposhere is the region of virtually all weather. The stratosphere starts just above the troposphere and goes up 31 miles. This layer, which includes the ozone layer, is drier and less dense than the troposphere. The mesosphere starts just above the stratosphere and extends to 53 miles high, with temperatures falling as low as 93¦ Celsius. The thermosphere, or uppe
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Approximate Word count = 582
Approximate Pages = 2 (250 words per page)
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