Science Riddles - Page 5

How are a ruby and sandpaper alike?
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How can the sun help you tell time?
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Where can you find Olympus Mons? (Hint: It is the largest volcano in our galaxy.)
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What is the hardest, most valuable, and most expensive natural substance in the world?
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Why do people yawn?
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What covers the Earth like a blanket, floats above the clouds and helps prevent cancer?
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What looks like a star, falls off a tail, and burns in the air?
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