The Earth's atmosphere surrounds the Earth. The Earth's atmosphere is made of gases. Those gases are what makes air pressure.
The Earth is So Special
The Earth is so special because it is the only planet we know that can support life. Some day though Mars might be turned into a planet that people live on.
Earth is Blue and Green
The Earth is blue because of all the oceans and lakes in the world. It is green because of all the land in the world. Most of the Earth looks blue because 2/3 is blue.