Earth
A clear sky contains very few what?
More Questions from Earth
Who published the groundbreaking book "Principles of Geology" in 1830?
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78% of the earth's atmosphere is composed of which gas?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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What percentage of known volcanoes are subaerial, meaning they erupt into the atmosphere?
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Which of these landforms is an area of land lying between hills or mountains?
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What natural disaster is caused by earthquakes but could also be caused by an asteroid?
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What is an underwater boat with its own power and air supply called?
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