Coal and Petroleum

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Across
  1. 1. This coal product is an almost pure form of carbon
  2. 5. This type of resources are present in unlimited quantity in nature
  3. 6. Coal, petroleum and natural gas are examples of _______ fuels
  4. 7. Various fractions of Petroleum are separated in a placed called Petroleum __________
Down
  1. 1. The process of formation of coal over millions of years
  2. 2. The C in CNG stands for ___________
  3. 3. Coal tar is used to make ____________ balls which repel insects
  4. 4. The petroleum product used for road surfacing