The atmosphere is a soup of chemicals. About seventy-eight percent of the soup is nitrogen and twenty-one percent is oxygen. The remaining one percent is a mix of the other gases, which play important role in health of the ecosystem. We move through this gaseous soup every day, pushing aside or breathing in billions of its moleculles. These moleculles not static, they are constantly interacting with each other in ways that can create new chemicals, and they are also interacting with the land, the sea, plants, and animals.