Earth
What is another name for permanently frozen ground?
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Which country produces about 1/5 of the world's garbage per year?
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Approximately what fraction of the Earth's air is made up of oxygen?
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The side of a sail furthest away from the wind is what?
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What natural disaster is caused by earthquakes but could also be caused by an asteroid?
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What was the most common type of rock to be found during the Precambrian Period?
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