Convection currents are made by heated gasses and liquids. We demonstrated this with an experiment (see video below). The right half of this dish is over a lit burner; the left half contains ice and food coloring. The ice cools the blue water, increasing the water's density. The cool water then flows under the warmer, less dense water, which flows up and back along the surface, until it reaches the cold side and the cycle starts again.
Convection currents also drive home heating, weather patterns, and plate tectonics.
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