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Earth
What mineral makes both sapphires and rubies when cut and polished?
Earth
What mineral makes both sapphires and rubies when cut and polished?
Topaz
Apatite
Corundum
Fluorite
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A line of equal or constant air temperature is what?
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Which of these types of pollution occurs naturally?
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What term describes the overflowing of rivers or streams?
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Which of these is not a type of a major oil trap?
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The Appalachian Mountains are best described as what type of mountains?
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Which of these terms can be used to describe steam?
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From what perspective does a map shows what the earth looks like?
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Mary Anning was the first to discover complete fossils of which prehistoric marine reptile?
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