Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
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Question: Optics explains the behavior of visible light and electromagnetic waves.

Answer: What type of physics explains the behavior of visible light and electromagnetic waves?


Question: During the early paleozoic, the amount of carbon dioxide in the atmosphere was much greater compared to today.

Answer: During the early paleozoic, the amount of carbon dioxide in the atmosphere compared to today was?


Question: Venus has the most volcanoes.

Answer:
What planet has the most volcanoes?