The shortname for oxygen in the periodic table, Invisible gas, It has no color and no smell, so you cannot see it, We breathe it, Humans and animals need it to stay alive, Makes rust, It causes iron and metal to turn orange over time., Inside water, It mixes with hydrogen ($H_2O$) to create oceans and rivers., Helps fire burn, Flames need this gas to catch and stay active., The Ozone layer, It is made of oxygen high in the sky to protect us from the Sun., Made by plants, Trees and leaves release it into the air for us.

Oxygen element

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