Liquids and gases ____ when they are heated. This is because the particles in liquids and gases move ____ when they are heated. When this occurs, the distance between particles ____, while the particles themselves stay the same size. As a result, the particles take up a greater ____. The liquid or gas in ____ areas is less dense than in ____ areas, so it rises into the cold areas. The liquid or gas in cold areas is more ____, so it falls into the warm areas. This way, a ____ current is created, which transfers heat throughout the substance.

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