Earth
What is the hardest mineral known on Earth called?
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What reef is the largest living structure on Earth?
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What kind of scientist would study rocks, minerals and mountains?
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What is water that flows over the ground rather than seeping into it called?
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What ongoing process allows water to be constantly recycled?
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What type of scientist studies microscopic plants and animals?
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Which of these African watersheds is the largest in size?
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What is a seven-letter word meaning "movement of weathered material from gravity"?
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