Question

When did the build up of three oxygen create our ozone layer

Answer 1

The build-up of three oxygen created our ozone layer around two billion years ago.

Explanation:

• The ozone layer is a part of the stratosphere which is located right after the troposphere in the atmosphere of the Earth.
• The ozone gas is made up of the abundance of three oxygen molecules combining with the ultraviolet radiation emitted by the Sun.
• The development of the ozone layer happened around two billion years ago when the oxygen concentration levels on the planet began to rise slowly and gradually.