Air
Air surrounds us all the time, and when it moves we feel it as wind. The envelope of air that surrounds the Earth is called the atmosphere. Our moon does not have any atmosphere, and the astronauts who travelled there in the 1960s and 1970s needed air tanks to breathe. Other planets in the solar system do have atmospheres, but the Earth is unique in that its atmosphere contains oxygen, which we need to breathe. Most of the rest of air is made of nitrogen. There are small amounts of other gases. Some of these are greenhouse gases which keep the planet naturally warm and suitable for life.
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