There was once an undersea post office in the Bahamas.
241
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
It's impossible to sink in the Dead Sea without equipment!
72
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
In 1992, 29,000 rubber ducks washed off a ship. They were found thousands of miles away 8 years later.
707
The Titanic is about as long as the Empire State building is tall.
174
The Caspian Sea is also classed as the world's largest lake.
52