| Answer | Crossword Clue |
|---|---|
| MOBIL | Gas giant half |
| MOBIL | Gas giant |
| AMOCO | Gas giant |
| AMOCOOIL | Old gas giant |
| HESS | Oil and gas giant |
| ARCO | Gas giant since 1966 |
| KOCH | ... Industries (oil and gas giant) |
| ARCO | Western U.S. gas giant |
| AMOCO | Gas giant that merged with BP |
| OXY | International oil and gas giant, informally |
