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A jar of hot red water is placed above a jar of cold blue water with a card between. After the card is removed, the liquids:

Astay mostly layered
Bmix quickly at once
Cswap places fully
Dboth turn to steam
Answer & Solution
Correct answer: A. stay mostly layered
Hot water is less dense and already on top, so there is no buoyant push to start convection and little mixing occurs.
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