Oxygen is made in stars
Oxygen is 1/5 of earths atmosphere
dry air is 21% oxygen
doesnt burn
almost half of earths crust is made of oxygen
3rd most abudement element
green and red colours in the aurora borealis (and australis) are caused by oxygen atoms.
cant live without it.
oxygen is clear (lol)
Too little oxygen is problematic. So is too much.
About 300 million years ago, when oxygen levels reached 35 percent.
Animals and plants require oxygen for respiration.
Oxygen gas is colorless, odorless, and tasteless.
