Across
- 1. A kind of fossil fuel
- 2. Fuel for stoves, lamps, and jet aircraft
- 4. Exhaustible natural resource
- 6. Petroleum product used as a road cover
- 7. Carbon form used in the manufacture of steel
- 8. Fuel used to produce electricity
Down
- 1. Group of petroleum byproducts used to make detergents
- 3. The process of separating fractions of petroleum
- 5. Coal is mainly made up of this element
- 9. Inexhaustible natural resource