The Caspian Sea is also classed as the world's largest lake.
52
Water is actually naturally blue.
48
Sharks, like other fish, have their reproductive organs in their chests.
248
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
Jellyfish as a species are actually older than dinosaurs and sharks.
383
The Titanic is about as long as the Empire State building is tall.
174
There was once an undersea post office in the Bahamas.
241