If it was made of pure oxygen, plants could not intake enough carbon, so they cannot give oxygen. This would ruin the entire cycle of life on land.
I hope this helps!
Both plates are folded into mountain ranges
Ir is the third opinion, 100km area
A loccaliths
Because of this, it is often difficult to determine what it is you are looking at for intance devils tower in wyoming was thought to be a volcanic neck but furthur study it should be an eroded liccalith
