The Mariana Trench is so deep that Mount Everest could be submerged in it with over a mile to spare.
Fact #4253
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Certain fish clean parasites from larger fish.
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Some deep‑sea fish create their own light.
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Exploration of the deep sea has revealed that bioluminescence is far more common than previously thought — it may be the dominant form of communication in the ocean's depths.
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NOAA's exploration of deep ocean vents has discovered ecosystems entirely dependent on chemosynthesis rather than sunlight.
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The Dead Sea is 10 times saltier than the ocean.
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The ocean contains structures larger than mountain ranges.
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The Pacific Ocean is deeper than Mount Everest is tall.
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Some deep-sea octopuses brood their eggs for years.
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