How can you tell apart different fuels i find it really confusing

Question: How can you tell apart different fuels i find it really confusing
- Keywords:
  fossil,
  fuel
Asked by maria1 to Sarah on 20 Jun 2011.
- Sarah Thomas answered on 20 Jun 2011:
  
  Heya,
  
  What kind of fuels? What do you find confusing?
  
  I will write a little bit about fossil fuels here and if that doesn’t answer your qu, put a comment on and I’ll try again!
  
  The main fossil fuels are oil, gas and coal. Oil and gas were formed by the remains of marine life being buried under the sea bed. Coal was formed by the remains of vegetation being buried in bogs. Once buried, the organic matter could get to the oxygen and was subjected to immense pressure and eventually it was converted into the fossil fuels. It took millions of years for this to happen which is why fossil fuels are said to be running out, because we can’t make any more. This is why there is a race to find clean green and renewable energy, because people think fossil fuels are going to become to expensive to obtain within the next 100 years!

Question: How can you tell apart different fuels i find it really confusing