Environmental change due to the presence of life on earth

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  • How the presence of life on Earth has brought about environmental change
    • Atmospheric Oxygen
      • Small amount of oxygen released by the photolysis of water
      • Later on, photosynthetic plants gradually released large amounts of oxygen
    • Atmospheric Carbon Dioxide
      • Naturally released into atmosphere by volcanoes
      • Essential greenhouse gas
      • Helps to retain heat in the atmosphere to support life
    • The Water Cycle
      • Heat energy from absorbed sunlight causes water in the sea to evaporate
        • May be carried over land where it falls as rain then flows back into the sea
      • Transpiration by plants returns water vapour to the atmosphere so it can be blown further inland


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