Warm air moves up. Cold air moves down. This makes a circle. It helps move heat around. It happens in the sky and sea. 
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Convection-snapshot.png
Ghillie Kettle Thermal.jpg
Bénard cells convection.ogv
Thermal-plume-from-human-hand.jpg
Thermal circulation.png
ConvectionCells.svg
Earth Global Circulation.jpg
foehn1.svg
Thunderstorm formation.jpg
Conveyor belt.svg
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Structure of Stars (artist’s impression).jpg
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Content adapted from Wikipedia
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Readability: FK 12.6
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Vital Level 4