Earth
Approximately what fraction of the Earth's air is made up of oxygen?
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What weather-related season is between June 1 and November 30 in North America?
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What is the name of the fossil resin that is often used in jewelry making?
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Which of these terms can be used to describe steam?
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Where in Arizona is the sun blocked 10% of the time?
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What name is used specifically to describe the region around the South Pole?
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What is a region of Earth in which all areas share the same time called?
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What are minerals found in high quantities and worth mining called?
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