With an average flow of about 200,000 cubic metres per second, the Amazon alone delivers nearly 20% of all the fresh water rivers pour into the oceans. Its freshwater plume stretches hundreds of kilometres into the Atlantic and can be seen from space. Despite its size, not a single bridge crosses its main channel.
On 27 August 1883, the eruption of the Indonesian volcano Krakatoa was heard as far away as Rodrigues Island, nearly 4,800 km away. Its pressure wave was picked up by barometers worldwide and circled the globe several times. The tsunamis that followed killed more than 36,000 people.
The deepest known point in the ocean, Challenger Deep, lies roughly 10,900 m below the Pacific surface. Drop Everest in and its summit would still sit about 2 km underwater. Down there, the pressure is more than 1,000 times what you feel at sea level, roughly a tonne pressing on every square centimetre.