The liquid or gas in hot areas is _________ dense than the liquid or gas in cold areas.

less

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moderate

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both b and c

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Solution

The correct option is B less
The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. The denser cold liquid or gas falls into the warm areas. In this way, convection currents that transfer heat from place to place are set up.

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