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Convection and the Mechanism of Plate Tectonics

Description
(a) Heat supplied by the heating coil warms the water at the bottom of the pot. The heated water consequently expands,
decreasing its density. This lower-density water rises (like bubbles in soda) and transfers its heat to the cooler surroundings.
When the hot, rising water gets to the top of the pot, it loses a lot of heat into the room, becomes denser, and sinks back
to the bottom of the pot to repeat the process
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