On a hot day, the upstairs rooms in a house are usually hotter than the downstairs rooms. Why? A. Cool air is less dense than warm air. B. Warm air rises and cool air sinks. C. The upstairs rooms are closer

On a hot day, the upstairs rooms in a house are usually hotter than the downstairs rooms. Why? A. Cool air is less dense than warm air. B. Warm air rises and cool air sinks. C. The upstairs rooms are closer to the sun. D. Heat rises.

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On a hot day, the upstairs rooms in a house are usually hotter than the downstairs rooms. Why? A. Cool air is less dense than warm air. B. Warm air rises and cool air sinks. C. …

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