C1

C1

1. Evolution of the Atmosphere

   • Originally molten
     • millions of years
     • any atmosphere melted
   • Cools down
     • Thin crust formed
     • Volcanos kept errupting
       • Gave off gases
         • Carbon dioxide
           • Made up most of early atmosphere
         • Water vapour
           • condensed to form oceans
         • Nitrogen
     • Green plants evolved
       • Removed CO2
       • Produced O2
       • Died and formed sediment
         • Carbon locked up
   • Organisms
     • Simple Organisms died
       • Too much O2
       • Complex organisms evolved

2. Atmosphere today

   • Nitrogen-78%
   • Oxygen-21%
   • Argon-1%
   • Human activity
     • Adding pollution
       • Burning fossil fuels
         • Powerstations
         • Vehicles
       • Harmful to humans
       • Harmful to enviroment

3. Fossil fuels

   • Hydrocarbons
   • Burning fossil fuels
     • Oxidation/Combustion
     • Reduction
   • Carbon
     • Carbon dioxide
       • Green house effect
         • Warming up earth
           • Sea level rising
     • Carbon monoxide
       • Formed in a incomplete burning
       • Poisonous
     • Carbon particulate
       • tiny particles
       • Fall as soot
         • Make building look dirty
   • Sulfur
     • From impurities in fuel
       • Sulfur dioxide
         • Falls as acid rain
           • Kills plants and animals
           • Damages buildings and Statues
   • Nitrogen

4. Reducing pollution