How does the traditional Korean floor-heating system called ondol work?

Answer and explanation

Correct answer: B. Hot air or smoke from a fire passes through flues beneath a stone floor

  1. Step 1: Korean winters are long and cold. Step 2. The floor stores heat and radiates it into the room. Answer: Hot air or smoke from a fire passes through flues beneath a stone floor. Why not the others: The other systems are used elsewhere.

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