Question

How does oxygen gas come in the atmosphere of earth​

Answer 1

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity. ... By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

Answer 2

Hey friend here is your answer . . . . .

It is mainly from plants and trees that oxygen is found in the Earth's atmosphere.

Hope it helps you !!!