Glacial periods caused sea levels to drop significantly.
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The Earth's mantle lies between the crust and core.
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The Sahara Desert was once much greener than it is today.
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The Petronas Towers were once the tallest buildings in the world.
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The Eiffel Tower was supposed to be demolished 20 years after its construction in 1889.
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Around 90% of the world's population lives in the Northern Hemisphere.
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Ancient civilizations often formed near rivers.
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The Great Wall of China spans thousands of miles.
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The London Underground is one of the oldest metro systems in the world.
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