The current human population could fit inside a cube 1 mile on each side.
Fact #3481
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Mongolia is the world's least densely populated country, with about 5 people per square mile.
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There are lakes beneath Antarctica’s ice.
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The ocean contains structures larger than mountain ranges.
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The Aswan High Dam controls flooding of the Nile River.
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The Andes are one of the longest mountain ranges in the world.
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Greenland is 80% covered by ice — if it all melted, global sea levels would rise about 20 feet.
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The Sahara Desert contains vast rocky plateaus as well as sand dunes.
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The Nile Delta is one of the world's largest river deltas.
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