For most people, the world's largest waterfall brings to mind towering cliffs, crashing water and famous landmarks such as Niagara or Angel Falls. Yet Earth's biggest waterfall is nowhere to be seen. It lies hidden deep beneath the ocean between Greenland and Iceland, where an extraordinary natural process has been taking place for thousands of years. Every second, billions of litres of icy, dense seawater sink beneath warmer Atlantic waters, creating a vast underwater cascade that dwarfs any waterfall on land.
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