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A compound made of hydrogen and oxygen
Key Context
You can drink a big glass of it to cool you down when it is hot. In the winter, you may shape it into balls and throw it to a friend. In the spring, it may fall from the clouds for hours. What are we talking about? Water! Every living thing needs water. Water is made of two gases, hydrogen and oxygen. Water forms into ice in areas that are very cold. If water is heated, it becomes a gas called water vapor or steam. As a liquid, water is found in lakes, rivers, and oceans. In a lake or river, it is called fresh water. Humans, plants, and animals need fresh water to survive. Nature uses water over and over again on Earth.