Air is the standard term for a mixture of gasses that constitute the Earth’s atmosphere. The gas is chiefly nitrogen, mixed with argon, water vapour, oxygen, trace gases, and carbon dioxide. Air contributes to a significant factor for the survival of living creatures. In this chapter, students will learn the significance of air and how it is essential for our survival. Students can refer to the Class 7 Geography Chapter 4 Notes to understand elaborate explanations on the structure of the atmosphere, composition of the atmosphere, and climate, weather, and so on.