How does the Earth's atmosphere get heated?

The heating of Earth's atmosphere is a classic example tested in competitive exams. Option A (Conduction) is incorrect — air is a poor conductor of heat. The atmosphere cannot primarily heat itself by conduction because air molecules are not closely packed, making conduction negligible over large scales. Option B (Radiation) is incorrect — while the Sun heats the Earth's surface by radiation, the heating of the atmosphere itself (air above the surface) is not primarily by radiation from the surface directly. Option C (Convection) is CORRECT — Earth's atmosphere is heated primarily by convection. The sequence is: (1) Sun's radiation heats Earth's surface. (2) The surface heats the air in contact with it by conduction and radiation. (5) This continuous cycle of rising warm air and sinking cool air is convection. This creates all weather patterns, winds, monsoons, and atmospheric circulation. Option D (All of the above) is incorrect — while all three modes play some role, the image clearly identifies convection as the primary method of atmospheric heating.