Up to about 3000 millon year ago, there was no oxygen in the Earth's a

1.	Up to about 3000 millon year ago, there was no oxygen in the Earth's atmosphere. Today, about one fifth of the atmosphere is oxygen gas.
Answer» Explanation: many years ago EARTH was full of lava and MAGMA with huge volcano. when rain came these magma began to solidify and become rocks and water begin to GET collected. when ice age came these water got frozen and after many years due to harsh temperature and environment these water begin to splitt. H2O ----> H2 + O2 and oxygen began to form. the major cause of oxygen PRODUCTION where trees that began to grow and because of PHOTOSYNTHESIS oxygen got liberated and due to these factor , oxygen is in larger amounts or 1/5th of earth's atmosphere.

Up to about 3000 millon year ago, there was no oxygen in the Earth's atmosphere. Today, about one fifth of the atmosphere is oxygen gas.

Answer»

Explanation:

many years ago EARTH was full of lava and MAGMA with huge volcano. when rain came these magma began to solidify and become rocks and water begin to GET collected.

when ice age came these water got frozen and after many years due to harsh temperature and environment these water begin to splitt.

H2O ----> H2 + O2

and oxygen began to form.

the major cause of oxygen PRODUCTION where trees that began to grow and because of PHOTOSYNTHESIS oxygen got liberated and due to these factor , oxygen is in larger amounts or 1/5th of earth's atmosphere.

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