Earth, piece 3 of 9
Earth's air is about 78 percent nitrogen and 21 percent oxygen, with traces of other gases. The oxygen exists because plants and other living things have been releasing it for billions of years.
| Card | Earth 3 |
|---|---|
| Set | Planets |
| Edition | Puzzle |
| Book value | Est. 25 to 60 Credits once graded |
| Checklist | 30 / 90 |
| Rarity | Uncommon |
| Owned | 4 |
Earth's air is about 78 percent nitrogen and 21 percent oxygen, with traces of other gases. The oxygen exists because plants and other living things have been releasing it for billions of years.