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dec 22, 1933 - December 22, 1933 5:52:00 am Some oxygen converted to ozone to form a protective layer against UV radiation First life on surface of ocean/land possible because of protection from ultraviolet radiation

Added to timeline:

Timeline of Earth Redone

ByEmily Rudo
1 Oct 2018
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Date:

dec 22, 1933
Now
~ 91 years ago
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