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hot air sinks and cold air rises
hot air rises cold air sinks
why does hot air rise and cold air sink
hot air rises cold air sinks called
when hot air rises and cold air sinks
hot air rises cold air sinks convection
hot air sinks and cold air rises, hot air rises cold air sinks, why does hot air rise and cold air sink, hot air rises cold air sinks called, when hot air rises and cold air sinks, hot air rises cold air sinks convection
