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The global carbon cycle (Uses (building blocks (Chalk, limestone),…

- - - - The atmosphere
      - The oceans
        
        most of the carbon not found in carbonated rocks is found the ocean as dissolved CO2
      - Carbonated rocks
        
        By far the biggest carbon store
      - fossil fuels
      - plants
      - soils
    - - How ever these stores play a crucial in the carbon cycle
      - they also represent most of the carbon in circulation at any one time
- - - - Where marine organisms make their shells and skeletons by fixing dissolved carbon together with calcium (forms calcium carbonate)
        
        when the organisms dye the remains fall to the sea floor
        
        there they accumulate and over mils of yrs heat, pressure convert them to sedimentary rocks
    - - The acid attacks carbonate minerals in rocks
        
        This releases CO2 to the atmosphere, and dissolved form to streams, rivers and oceans
    - - Like deep-ocean sediment, these fossils fuels act as carbon sinks that endure for millions of yrs.
- - - - atmospheric CO2 dissolves in ocean surface waters
      - The oceans ventilate CO2 back to the atmosphere
      - exchange individual carbon atoms are stored (by natural sequestrations) in oceans
- - - - e.g. food, timber, paper, textiles and many other products
  - - - E.g.
        
        Oil
        
        also used as a raw material
        
        E.g. manufacturing products (e.g. plastics)
        
        Coal
        
        natural gas
      - Powers the global economy