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ENERGY (SOURCES : we can classify energy sources in several ways (By…

- - - - may or may not be abundant
      - depleted when we use them up
      - cannot be renewed in a short period of time
  - - - examples : crude oil , natural gas , coal, nuclear energy and renewable energy
      - obtained directly from nature
    - - resulting from transforming of prymary sources
      - examples: electricity, some petroleum derivates
  - - - Most commonly used in industrialised countries
      - example: energy that comes from fossil fuels
    - - alternative energy sources
      - in early stage of their technological development
      - Solar and wind power belong to this group
  - - - low enviroment impact
      - don't generate by-products that pollute the enviroment