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Oxygen:

Oxgen is Element No. 8 on the Periodic Table.  Oxygen keeps most things on Earth, including us, living, enabling us to be able to breathe.
Oxygen is the third most abundant element in the universe.

We breathe O2 in and CO2 out.

 

Fun Facts About Oxygen:

  • As a gas, oxygen is clear. But as a liquid, it's pale blue.

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    If you've ever wondered what swimming in a pool of liquid oxygen would be like, the answer is: very, very cold. Oxygen must get down to minus 297.3 F (minus 183.0 C) to liquefy, so frostbite would be a problem.

  • Too little oxygen is problematic. So is too much. Breathing 80 percent oxygen for more than 12 hours irritates the respiratory tract and can eventually cause deadly fluid build-up, or edema.

  • Thank goodness for an atmosphere of 21 percent oxygen. About 300 million years ago, when oxygen levels reached 35 percent, insects were able to grow super-large: Think dragonflies with the wingspans of hawks.

     

     

     

     

     

     

     

     

     

 

 

 

 

 

 

 

 

 

 

 

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