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Fill in the blank: Planet Mars looks reddish in the sky. It is due to the __________ on the martian surface.
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Question:Fill in the blank: Planet Mars looks reddish in the sky. It is due to the __________ on the martian surface.
1.Iron in dust
2.Ferric oxide
3.Ferrous oxide
4.Ferric sulphides
Show Answer
Answer:2
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