Earth

Approximately what fraction of the Earth's air is made up of oxygen?

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What clouds have bases between 6,000 and 18,000 feet?
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How many planets are in the Earth's solar system?
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Where is the foggiest place in the world?
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John Glenn first orbited the earth in what year?
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What winds in California are responsible for forest fires during the winter?
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What is hail made of?
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What does granite become when put under heat and pressure?
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Earth is located in which galaxy?
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