Across
- 3. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
- 5. liquid mixture of hydrocarbons that is present in certain rock strata
- 6. the production and discharge of something, especially gas or radiation
- 8. a boring into the earth or sea bed for the extraction of petroleum
- 9. occurs when the liquid form of petroleum leaks into an ecosystem due to anthropocentric (human) causes
- 10. Compound containing Hydrogen and Carbons only
Down
- 1. separation of liquid mixture into fractions differing in boiling point
- 2. well or shaft drilled through rock, from which petroleum is drawn
- 4. layer or a series of layers of rock in the ground
- 7. unrefined petroleum