Dzhema Balobanova

It’s possible to find rivers and lakes beneath the ocean.
When salt water and hydrogen sulfide combine, it becomes denser than the rest of the water around it, enabling it to form a lake or river that flows beneath the sea.

Over 70 per cent of our planet’s oxygen is produced by the ocean.
It’s thought that between 70 and 80 per cent of the oxygen we breathe is produced by marine plants, nearly all of which are marine algae.

Botrylloides violaceus and Tricellaria inopinata

We still only know a fraction of the marine species in our oceans.
According to the World Register of Marine Species there are now 240,470 accepted species, but this is believed to be just a small proportion of the species that exist, with new marine life being discovered everyday.

There are more historic artefacts under the sea than in all of the world’s museums.
Around 1,000 shipwrecks lie off the Florida Keys alone, some of which are within the Florida Keys National Marine Sanctuary. Other underwater museums have been created in recent years, including the Mediterranean’s submerged bronze statue, Christ of the Abyss.

The world’s longest mountain chain is underwater.
Earth’s longest chain of mountains, the Mid-Ocean Ridge, is almost entirely beneath the ocean, stretching across a distance of 65,000 kilometres. It’s said that this mountain chain is less explored than the surface of Venus or Mars.

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Oceans 101 | National Geographic Oceans serve as the planet’s largest habitat and also help to regulate the global climate. But why is the ocean salty? And how is climate change impacting th...

Less than five per cent of the planet’s oceans have been explored.
According to the Ocean Service, man has explored less than five per cent of Earth’s oceans. As researchers strive to discover more, we’re continually getting to know our oceans better.

Our oceans cover more than 70 per cent of the Earth’s surface.
With so much of the Earth’s surface taken up by ocean, it’s evident how vital these marine environments are to the planet, and how much there still is to be explored.