The world's longest fence is Australia's Dingo Fence — 5,614 km to protect sheep from dingoes.
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There are deep ocean trenches deeper than Mount Everest is tall.
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The Amazon rainforest produces about 20% of the world's oxygen.
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The largest living structure on Earth is the Great Barrier Reef.
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Wealth inequality exists in nearly every country.
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The first printed book was the Gutenberg Bible, produced around 1455 in Mainz, Germany.
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The Great Barrier Reef is located off the coast of Australia.
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Mount Everest is the tallest mountain above sea level.
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