The Sahara Desert was once home to large lakes and grasslands.
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The tallest mountain above sea level is Mount Everest.
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The largest island in the world is Greenland.
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The Gotthard Base Tunnel is one of the longest railway tunnels in the world.
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There are abandoned cities on Earth that nature is slowly reclaiming.
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The Earth's crust is composed of tectonic plates.
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Australia is wider than the Moon — Australia is about 4,000 km across, the Moon's diameter is 3,474 km.
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The CN Tower in Toronto was once the tallest free-standing structure.
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Lake Baikal is the deepest freshwater lake in the world.
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