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Nine fascinating facts about the sea

Fancy a dip? drowns you in an ocean of facts in just under four minutes, so roll your trouser legs up and come on in, the water’s lovely... Here are eight startling facts we learned to ease you in.

1. In 800BC, the sea was believed to be simply what surrounded the flat disc that was the Earth.

2. Ancient Greek philosopher Democritus thought that the sea was drying out and would eventually disappear.

3. People were perplexed about the saltiness of the sea, and it was described as ‘the sweat of the earth’.

4. Pliny thought sea was saltier at the surface.

5. Aristotle realised sea water was denser than fresh water.

6. King Svera of Norway informed people confidently in 1180AD that there was a huge kraken marauding the waters between Norway and Iceland.

7. In 1830, Edward Forbes tried to prove that nothing could live in the sea at a depth greater than 1800 feet.

8. There are 50 billion atoms of gold in every drop of sea water.

9. If you processed enough sea water to get two and a half ounzes of gold, you would also get tonnes of lead, mercury, chromium, silver, titanium, lithium, silicon and nitrogen, but you’d have to evaporate one billion litres of sea water which would cost £90trillion.

Watch Everything We've Ever Known About... The Sea

The Sea

The history of everything we ever thought we knew about the sea, in four minutes.

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