Water covers about 70% of the Earth's surface, it's the liquid form of the chemical H2O.
The H stands for Hydrogen and the O is for oxygen. Each molecule of water contains two bits of hydrogen and one bit of Oxygen, that's why the number 2 appears after the H.
If you freeze water it turns into a solid called ice, boiling changes it into a gas called water vapour.
Where can I get some?
About 97% of the water on the Earth's surface is in the world's oceans.
This is where you can find most of the other 3%:
Lakes Rivers Polar ice caps Clouds Rain Stored in rocks (aquifers) Sea ice
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