3.1 | The atmosphere
3.2 | Weather effects
3.3 | Obtaining weather information
The atmosphere consists of a lot of different gases. Nitrogen (78%) and oxygen (21%) are the main gases you find in the atmosphere; the remaining 1% consists of all kinds of other gases such as argon, carbon dioxide and hydrogen. In addition, the atmosphere is divided into 5 layers: the troposphere, stratosphere, mesosphere, thermosphere and ionosphere. Most aircraft flights take place in the troposphere, the lowest layer.