Earth's atmosphere is composed of a series of layers, each with its own specific traits. Moving upward from ground level, these layers are called the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Learning Objectives Meaning of Composition of Atmosphere Composition of Atmosphere Nitrogen Oxygen Argon Carbon dioxide Methane Ozone Water Vapour Dust Particles Aerosols Meaning of Structure of Atmosphere Structure of Atmosphere Homosphere Troposphere Stratosphere Mesosphere Heterosphere Thermosphere Exosphere Importance of the Atmosphere Summary and Conclusions Introduction The atmosphere of the earth is a vast expanse of gases enveloping our entire earth. Within this envelope, we are ... The atmosphere of earth has five main layers, the Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere. Each layer is crucial for life and various phenomena. Learn about the four layers of the Earth's atmosphere: troposphere, stratosphere, mesosphere and thermosphere, and how they differ in temperature, pressure and composition. Find out how to remember the layers with a mnemonic device and see examples of phenomena that occur in each layer.