The atmosphere is one of the most important parts of our planet. Without it, humans would not be able to exist on Earth. It contains gasses vital for sustaining life, breathing, and interacting with other organisms. The atmosphere contains nitrogen, oxygen, and a host of other gasses along with everything humans emit into the air, including greenhouse gasses that contribute to climate change. Your study of the atmosphere includes both the science of the atmosphere and how humans have changed the atmosphere over time. But how does it work? These study guides will cover what the atmosphere is and why it's so vital to our study of earth science. Check out Fiveable's free guides to learn more!