It took scientists 375 years to discover the eighth continent of the world, which
has been hiding in plain sight all along
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In 2017, a group of geologists
hit the headlines when they
announced their discovery of Zealandia –
Te Riu-a-Māui in the Māori language. A vast continent of 1.89 million sq miles (4.9 million sq km) it is around six times the size of Madagascar.
Though the world's encyclopaedias, maps and search engines had been adamant that there are just seven continents for some time, the team confidently informed the world that this was wrong. There are eight after all – and the latest addition breaks all the records, as the smallest, thinnest, and youngest in the world. The catch is that 94% of it is underwater, with just a handful of islands, such as New Zealand, thrusting out from its oceanic depths. It had been hiding in plain sight all along.
"This is an example of how something very obvious can take a while to uncover," says Andy Tulloch, a geologist at the New Zealand Crown Research Institute GNS Science, who was part of the team that discovered Zealandia. But this is just the beginning. Four years on and the continent is as enigmatic as ever, its secrets jealously guarded beneath 6,560 ft (2km) of water. How was it formed? What used to live there? And how long has it been underwater?
Despite being thin and submerged, geologists know that Zealandia is a continent because of the kinds of rocks found there. Continental crust tends to be made up of igneous, metamorphic and sedimentary rocks – like granite, schist and limestone, while the ocean floor is usually just made of igneous ones such as basalt.
https://www.bbc.com/future/article/2...tm_source=digg
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