The Sahara Desert was once much greener than it is today.
Fact #20
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The longest river in the world is often considered to be the Nile.
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The ocean contains structures larger than mountain ranges.
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The ocean contains structures larger than mountain ranges.
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Vatican City is the world's smallest country — it covers just 0.44 square kilometers.
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The tallest mountain from base to peak is Mauna Kea in Hawaii — it's just mostly underwater.
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The Amazon rainforest spans nine countries.
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Mount Everest is the tallest mountain above sea level.
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The Nile flows northward — it is one of the few major rivers in the world that flows from south to north.
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