a convection current moves in a looped pattern.... much like welding... easier do disperse large amounts of heat in a circular pattern rather than a straight line.
hope this helps!
When magma reaches the top, it cools from the crust, it sinks back down to the core. Just like the water, the magma usually goes in a circular motion going up and down. Convection current is what moves plate tectonics/the crust.
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