What causes a glider to remain in the air?
OR
Explain how the birds are able to fly for hours without flapping their wings and glider is able to rise by riding on thermal currents which are streams of hot air rising in the sky.
Difficulty: Easy
A glider looks like a small airplane without an engine. Glider pilots use the upward movement of hot air currents due to the convection of heat. These rising currents of hot air are called thermals. Gliders ride over these thermals. The upward movement of air currents in thermals helps them to stay in the air for a long period.
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