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Water World (Water on the planet (Impact of climate change (Population…

- - - - 1,365,000,000km cubed
    - - 35,000,000km cubed
  - - - Glaciers and snow cover
      - Groundwater
      - Lakes and rivers
- - - - The water that you drink has been consumed before, likely many times, and been returned to the system
      - Closed system
  - - - The transfer of water from its liquid state to its gaseous state, water vapour.
    - - The liquid water lost from plants returns to the atmosphere as a gas
    - - Microscopic water droplets in clouds become water drops or snowflakes. Otherwise known as raining
    - - Water vapour becomes liquid water again. This happens when air containing water vapour is cooled
    - - When precipitation reaches the ground it either soaks into the ground or runs off the surface into rivers
    - - Some groundwater flow and surface runoff will reach rivers and streams where it generally continues its route towards the sea or ocean
- - - - Impacts on people
        
        Severe droughts occurred in 1984-85. leading to a famine in Ethiopia
        
        Grass and scrub was cleared to allow farming on steep slopes, but drought followed by heavy seasonal rains increased soil erosion, so farming is less productive
        
        During dry spells, soil in fields blows away, creating dust storms
        
        Lower rainfall and eroded land leads to desertification
        
        As rainfall has decreased and become more unreliable, people have been forced to migrate to cities