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What is water made out of?
Answer 1:

Water is made out of two elements called hydrogen and oxygen, which are both very common in the universe.

H2 O - - > H + H + O

The smallest unit of an element is called an atom. In water, 2 hydrogen atoms and one oxygen atom combine to form one water molecule. This water molecule is still very tiny. An ounce of water is made up of a gigantic number of water molecules--more than a trillion trillions of molecules!



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