noun
a current in a fluid that results from convection, especially one in the atmosphere or ocean that transfers heat from one part of the fluid to another
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Convection currents are responsible for the movement of magma beneath the Earth's crust.
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You can see convection currents in action when you boil water in a pot.
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The convection currents in the atmosphere are like nature's air conditioning.
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Just like convection currents distribute heat, ideas can spread and influence people in a similar way.