Earth

What color was the dust that swept the Great Plains?

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Ruby and sapphire are gem forms of which mineral?
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What can help farmers control erosion in their fields?
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A 17.5-inch hailstone was recorded in what U.S. state?
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From which does the Global Positioning System receive its information?
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Which family does the herb angelica come from?
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What is the weather phenomenon known as a "tsunami"?
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Which pairs of minerals are almost always found together?
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What is the main cause of caves?
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