Deep-sea fish produce no shadow — their photophores match the dim light above them exactly.
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The Pacific Ocean is larger than all the Earth's landmasses combined.
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Sharks predate trees by about 90 million years — they've been swimming Earth's oceans for 450 million years.
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About 71% of Earth's surface is covered by water, but 97.5% of that is saltwater.
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The Pacific Ocean is home to the Mariana Trench.
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The mimic octopus can imitate other sea creatures.
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Prehistoric coral reefs were similar to modern reefs.
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The ocean contains structures larger than mountain ranges.
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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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