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Earth had just formed and its atmosphere was made mostly of gases like hydrogen and helium. It was super hot with lots of volcanic activity, and there was no oxygen. Life didn’t exist yet.

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The atmosphere was full of poisonous gases like methane and ammonia. There was some water vapor too. Sunlight caused chemical reactions that started breaking down those gases and forming new ones like nitrogen and carbon dioxide.

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Tiny bacteria began using sunlight to make food with a process called photosynthesis. They took in carbon dioxide and released oxygen. Over time, oxygen levels grew and ozone formed high up, protecting life from the Sun’s UV rays.

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Green plants began growing on land. This helped increase oxygen in the atmosphere even more. The Earth started looking more like it does today. Oxygen helped support more complex life.

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Oxygen and carbon dioxide levels balanced out. The atmosphere became what we have today which is mostly nitrogen, some oxygen, and tiny amounts of other gases. The ozone layer protects life, and the atmosphere supports animals and humans.