Across
- 2. At high temperatures, more natural gas is formed than ____.
- 5. What kind of methane is formed when organic particles that are covered in mud and other sediments pile up?
- 6. The "rotten egg" smell that is added to natural gas to help detect leaks.
- 7. Natural gas is combustible mixture of ______gases.
- 8. Once brought from underground, natural gas is refined to remove ______.
- 9. What is natural gas primarily formed of?
Down
- 1. Natural gas is formed when organic matter is compressed under Earth at _____pressure.
- 3. Natural gas is formed by the remains of plants, animals, and _______.
- 4. Extracting a natural gas is _____.