Earth
Approximately what fraction of the Earth's air is made up of oxygen?
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How many days does it take for the Earth to revolve around the sun?
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What is a worldwide increase in temperature called?
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Weather radar that measures direction and speed of a moving object best fits which science term?
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What produces more energy than all the world's nuclear weapons combined?
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What activity allows humans to go underwater with oxygen tanks and a wetsuit?
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