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Earth
Ruby and sapphire are gem forms of which mineral?
Earth
Ruby and sapphire are gem forms of which mineral?
Corundum
Chrysoberyl
Chalcedony
Chrysoprase
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What imaginary line divides the Earth's northern and southern hemispheres?
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Who first charted the Gulf Stream?
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What type of gem is the Star of Africa or the Cullinar II?
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What is the term used to classify igneous rocks that are light in both color and gravity?
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Which of these is a warm spell of weather when ice and snow melt?
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The bottom layer of the atmosphere is called what?
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In Wyndham, Australia, it was 90 degrees for how long?
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Which of the following is magnetic?
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