C1 Air Quality

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  • C1 Air Quality
    • the evolution of the atmosphere
      • Phase 1: Volcanoes Gave Out Gases
        • Earths surface was molten
          • so hot any atmosphere boiled away
            • cooled down thin crust formed.
        • volcanoes kept erupting
          • carbon dioxide, water vapour, nitrogen
            • early atmosphere mostly C02 water vapour virtually no O2
              • Oceans formed when water vapour condensed when earth cooled
      • Phase 3:  Complex Organisms Evolved
        • build up of O2 killed off some organisms more complex ones evolved
        • virtually no CO2 left now
      • Phase 2: Green Plants Evolved and Produced Oxygen
        • green plants evolved over most of earth and where happy in CO2
          • they removed CO2 and produced O2 via photosyn-
            • when plants died carbon became locked up in sedimentary rocks as insoluble carbonates and fossil fuels
          • some CO2 dissolved in oceans
    • The atmosphere today
      • pollutants
        • human activity
          • burning fuels in power stations and vehicles
        • Nature
          • gases and particulates from volcanos
        • effects
          • direct harm e.g death CO reduces amount of O body can carry
          • indirect harm = damaging environment SO2 cause acid rain pollutes water sources killing fish which people eat  CO2 climate change rising sea level
      • Nitrogen 78% Oxygen 21% Argon 1%
        • small amounts of CO2, other gases and water vapour
        • Constant
    • fossil  fuel
      • fossil fuels are hydrocarbons
        • they contain just H and C
        • petrol diesel and fuel oil are mixtures of hydrocarbons
          • only difference between different fuels is the size of the HC they contain
      • formed from remainsdead plant sand animals over millionsyears
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