Earth
What type of gem is the Star of Africa or the Cullinar II?
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What is the federal weather agency in Canada called?
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About what percentage of solar radiation is absorbed by Earth's atmosphere, oceans and land masses?
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What is a seven-letter word meaning "movement of weathered material from gravity"?
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What organic material is formed from decaying organisms that mix with rocks?
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What is the name for the semiarid region that surrounds most deserts?
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