The Caspian Sea is also classed as the world's largest lake.
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Tidal forces between the Earth and Moon are slowing the Earth down and pushing the Moon further away.
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There are approximately three million shipwrecks on the ocean floor, worth billions in value and treasure.
22
Water is actually naturally blue.
48
Two dogs were among the Titanic survivors.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Sharks, like other fish, have their reproductive organs in their chests.
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