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.
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Scientists have confirmed that Enceladus, one of Saturn’s moons, has a watery ocean.
6
There was once an undersea post office in the Bahamas.
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In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
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The Caspian Sea is also classed as the world's largest lake.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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