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  1. Ozone hole
    Any part of ozone layer that has become deplpted by atmospheric pollution, resulting in excess ultraviolet radiation passing through the atmosphere.
  2. Acid
    An acid is a chemical substance that adds hydrogen ions to a solution.
  3. Coal gasification
    Production of combustible organic gases( mostly methane) by applying heat to coal in an oxygen enriched enviornment.
  4. Green house effect and GH gases
    • 1. Chem. substance that increase earths surface temp bc they act like glass in a greenhouse.
    • 2. sunlight is absorbed by plants, dirt, building and is converted into heat. The heat is infrared radiation then lises, but is trapped in atmosphere by GH.
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