Earth
What is the very bottom soil horizon called?
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Mary Anning was the first to discover complete fossils of which prehistoric marine reptile?
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Advection, freezing and radiation are types of what weather phenomenon?
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What is the name of the single continent that existed early in Earth's history?
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What was the nationality of the scientist who demonstrated a heliocentric system?
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What front results when a cold front takes the area of a warm front?
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Approximately what fraction of the Earth's air is made up of oxygen?
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