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Non Renewable energy resources (Are (Fossil fuels (Once living things…

- - - - Sun's energy stored from 100 million years ago
        
        Via photosynthesis
    - - Petroleum oil
        
        Remains of plants/animals
        
        Heavy oil
        
        .
        
        Tar sands
        
        Dependent on density
        
        Light/medium
        
        .
      - Coal
        
        50-98%
        
        Ranked by degree of (coalification)
        
        Transformation into coal
        
        peat (lowest rank)
        
        Brown coal
        
        Sub-b. tuminous
        
        Bituminous
        
        1 more item...
        
        From once living plants
      - Gas
        
        Natural gas
        
        Found with crude oil
        
        LPG (liquified petroleum gas)
        
        From petroleum refinery
        
        Coal seam gas
        
        Found with black coal
        
        Contains methane