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What type of gem is the Star of Africa or the Cullinar II?
Earth
What type of gem is the Star of Africa or the Cullinar II?
Emerald
Ruby
Diamond
Sapphire
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Which of the following is a renewable resource?
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What is the place where an air mass forms called?
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Which of these might help keep erosion near a stream from happening?
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What region surrounds the North Pole?
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Where does most evaporation of water occur?
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What is the test that can help determine the hardness of a rock called?
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Which of these is also known as "squawroot"?
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Which is not a sedimentary rock?
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