Prehistoric coral reefs were similar to modern reefs.
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The largest living structure on Earth is the Great Barrier Reef.
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The Pacific Ocean is the deepest ocean on Earth.
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The Earth's oceans regulate global temperatures.
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Some deep‑sea creatures have never seen sunlight in millions of years.
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The Mariana Trench reaches depths of nearly 36,000 feet.
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The Mariana Trench is so deep that Mount Everest could be placed inside it and still be covered by over a mile of water.
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More than half of the world's coral reefs have been lost since the 1950s due to warming and acidifying oceans.
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The siphonophore can grow to extraordinary lengths in the ocean depths.
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