OXYGEN
| Date | Clue |
|---|---|
| 2022-04-12 | Most abundant element in Earth's crust |
| 2016-12-19 | Astronaut's tankful |
| 2014-10-22 | Element #8 |
| 2014-05-20 | Network co-founded by Oprah Winfrey |
| 2013-12-02 | Scuba tank content |
| 2007-03-18 | Space shuttle supply |
| 2006-03-16 | Something in the air |
| 2005-12-04 | About 21% of the atmosphere |
| 1994-09-03 | Astronaut's supply |