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Convection currents occur in many places- both liquids and gases. One example is the flow of magma beneath the surface of the lithosphere (crust), where magma is heated in the centre of the Earth, therefore rising to just beneath the crust, where it cools and then sinks back down towards the centre of the Earth in a repaeating cycle... Coincidentally, it is this motion that causes the movement of the Earth's tectonic plates worldwide, and is thus responsible for seismic and volcanic activity on a global scale.

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14y ago

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