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7Sci CH15

7th Science CH15 The Air Around You

TermDefinition
atmosphere layer of gases hundreds of kilometers thick that surrounds Earth; divided into the troposphere, stratosphere, mesosphere and thermosphere; made up of a mixture of solids, liquids, and gases
ozone gas layer in the stratosphere that absorbs some of the harmful rays of the sun, helping to protect Earth from harmful radiation that can cause sunburn and skin cancer
prevailing westerlies global wind system between 30 and 60 degrees latitude; these winds are deflected from their north or south path by Earth’s rotation
smog type of air pollution caused by the burning of fossil fuels; harms people, making them more susceptible to lung disease and heart trouble; harms plants, preventing them from absorbing the carbon dioxide they need
trade winds global wind system; created by air sinking and returning to the equator
troposphere atmospheric layer closest to the ground