Sea turtles imprint on the magnetic field of their birth beach — returning to the same kilometer of coastline decades later.
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The Atlantic Ocean is widening by about 2.5 cm per year as tectonic plates spread apart.
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Deep-sea fish like the barreleye have transparent heads and tubular eyes that can rotate to face upward.
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Deep-sea coral reefs exist without sunlight.
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The Dead Sea is so salty that nothing larger than bacteria can survive in it, and swimmers float effortlessly.
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The Dead Sea is shrinking by about one meter per year due to water diversion and evaporation.
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The ocean contains structures larger than mountain ranges.
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