A thermal is a bubble of rising air. Thermals are created by earth surfaces(parking lots, roads, forests) that are warmer than surrounding surfaces, for example because they're heated by the sun. These bubbles (or columns if they're continuously fed) of warmer air rise upwards, just like a balloon does. If your plane happens to be inside that bubble, then it will also rise, or descend less rapidly.

Details for MAN October 1955 Ted Goyet - Feno
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NameMAN October 1955 Ted Goyet - Feno
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