The world's longest coral reef is the Great Barrier Reef — 2,300 km along Australia's northeast coast.
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The Amazon River basin covers millions of square kilometers.
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The ocean contains structures larger than mountain ranges.
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The city of Istanbul spans two continents — Europe and Asia.
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The Pentagon Papers revealed previously undisclosed details about U.S. involvement in Vietnam.
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The CIA’s Phoenix Program operated during the Vietnam War.
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The first printed book was the Gutenberg Bible, produced around 1455 in Mainz, Germany.
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There are places in the ocean deeper than the height of Mount Everest.
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The Sahara Desert is roughly the same size as the United States.
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