Why does the wind blow? What does air pressure have to do with a thunderstorm? Why is a mountaintop snowy while the valley below is warm? The answers to these questions all involve the layer of air surrounding Earth-the atmosphere. Earth's atmosphere is always in motion. It moves clouds, storms, and warm and cold air from one part of the planet to another. In this fact-packed book, discover how the ever-changing atmosphere determines weather around the globe.
