Thermals are created when the Earth’s surface heats unevenly as a result of solar radiation. The ground is warmed by the Sun, and so the air directly above it is warmed as well. The warmer air expands and becomes less dense than the surrounding air mass. The lighter air rises and then cools due to its expansion at lower high-altitude pressures. When it has cooled to the same temperature as the surrounding air, it stops rising. Good sources of thermals include dark earth, urban areas and roadways.
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