The reason it’s blue
The ‘deep blue sea’ – and our ‘blue planet’ along with it! – owe their iconic colour to the light of the sun. When the sun shines on the ocean, the water absorbs the longer red and orange wavelengths of light while reflecting blue light back. This will only happen, though, with a large amount of water; the more water you have, the bluer it is. This is why the water you drink out of a glass doesn’t appear ocean-blue. This process of light absorption and reflection is also the reason the sky is blue – but the blue colour of the ocean is not because it’s reflecting the colour of the sky, as many people believe.
The ocean is full of gold
The phrase ‘liquid gold’ was never so applicable. Believe it or not, every drop of ocean water contains a teeny-tiny bit of real gold. It’s such an inconsequential amount that you’re not going to get rich by scooping up seawater – there are about 13 billionths of a gram of gold in every litre of seawater. But when you consider just how much ocean water there is on the entire planet, that does add up to a lot of gold. About 20 million tonnes of it, to be specific! Considering that that amount would be worth hundreds of trillions of dollars, the ocean’s hidden gold is truly an unattainable fortune.
It comprises 99 per cent of the planet’s habitable space
Wait, what happened to only 70 per cent? Well, there’s a difference between the amount of the Earth’s surface covered by ocean (that’s 70 per cent) and the total amount of space. With the depths of the oceans taken into account, the ocean comprises a whopping 99 per cent of all habitable space on the planet. Despite all that open space, though, the ocean isn’t as populated as the land is, in part because the deepest parts of the ocean are inhospitable to all but a few life forms.
Our oceans are in trouble but these 11 crazy out-of-the-box ideas might just help our oceans