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Water is the most abundant molecule on the surface of earth , making up 70-75% of the earth's surface, and made of two atoms of Oxygen and one of Hydrogen
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...symbols; H2O or HOH.
The question shows the letters from 'H' to (sounds like two) 'O'.
It's a pun. Don't you get it?
Having Fun with (not at) the Chemical Elements, electrons, Molecules, etc.