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Notes on Science for Class VII, Chapter- 8, WINDS, STORMS AND CYCLONES, , What happens when air is heated ?, , When air is heated it expands becomes lighter and goes up., How does air move ?, , See text book page 83., , How are wind currents generated ?, , Wind currents are generated due to , a) Uneven heating between the equator and the poles., , b) Uneven heating of land and water., , What bring rain?, , Monsoon winds carrying water bring rain., , Explain the structure of a cyclone., , See text book page 87., , What factors contribute to the development of cyclones ?, See text book page 87., , How is cyclone known in different parts of the world ?, See text book page 89., , What is a tornado ?, , See text book page 89., , What should we do if we are staying in a cyclone hit area ?, See text book page 90., , Explain why holes are made in hanging banners and hoardings ?, , Holes in the banners and hoardings help air to pass through them. Hence, banners, and hoardings can withstand the pressure of air and remain intact., , XXXXXXXXXXXX