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Convection works because __________.

A. materials are denser when they are hot
B. heat travels from cold to hot regions on Earth
C. materials are denser when they are cold
D. cold materials are liquids

1 Answer

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Convection is the transfer of thermal energy by the movement of a liquid or gas. Convection works when a liquid or gas is unevenly heated. Hot liquids (and gases) are less dense and rise, causing. The warmer section of the material will rise while the cooler part sinks.
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