Winds, Storms and Cyclones Class 7 Science Notes – Chapter 8
Air is defined as an invisible substance which surrounds the earth in the gaseous form. It is mainly a mixture of nitrogen and oxygen. Wind is defined as the moving air. Air exerts pressure. On heating, air expands and occupies more space. Whereas on cooling it contracts. The land near the equator warms faster during summer and therefore the temperature of the land is high when compared to the ocean water. The air over the land area heats and rises. The warm air is lighter than the cold air and causes the wind to flow from oceans to lands. These are called monsoon winds. These winds carry water and hence it rains. Please refer Winds, Storms and Cyclones Class 7 Notes for more revision notes.
CBSE Revision Notes 