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The complete history of the Universe -- from the Big Bang to 200 my into the future

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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

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Ozone

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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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

eBook only $2.99
398 pages, 300 images

"I find the science fabulous...an extremely useful teaching tool."
Professor David Christian

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