| Answer | Crossword Clue |
|---|---|
| ETHANE | Constituent of natural gas |
| ETHANE | Constituent of natural gas. |
| ETHANE | Natural gas constituent |
| METHANE | Natural gas constituent |
| METHANE | Marsh gas constituent |
| ETHANE | Component of natural gas |
| ETHANE | Part of natural gas |
| ODOR | Sign of a natural gas leak |
| QATAR | Site of the world's largest single reservoir of natural gas |
