Convection: the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
hope that helps :)
A heater letting of heat is an example of release of energy. Please comment if you have any questions about my answer.<span />
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I think your answer is 2 because the temperature will rise so the particles will move faster
