Earth
Approximately what fraction of the Earth's air is made up of oxygen?
More Questions from Earth
Which of these habitats is a dry one usually with sand and can sometimes be very hot?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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What is the term used to classify igneous rocks that are light in both color and gravity?
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Which of these rivers is most likely a glacial boundary river?
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What is the transport of top layers of soil to another place called?
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