____ is the way in which thermal energy is transferred in ____ (liquids and gases). Heat energy causes the ____ in the gas or liquid to move further ____. This makes the substance ____ dense and causes it to ____. As the particles move further ____ from the heat source, they ____ heat energy and the substance ____ down. As a result, the particles move ____ together, and the substance becomes ____ dense, eventually ____. The substance is ____ again, and the cycle continues. The whole process is known as a convection ____.

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