History of the Universe

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Another important effect of oxygen was in the atmosphere. When sunlight hits oxygen molecules at the top of the air it rearranges them into ozone, a molecule made of three oxygen atoms.

Ozone contains three oxygen atoms

Ozone absorbs dangerous ultraviolet rays from sunlight. For the first time the land became safe for life. Life on Earth would be dangerous without it. The ultraviolet rays would cause skin cancers.

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