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