The latest maps of the world's eighth continent - BBC Future - 0 views
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in 2017, the story took an unexpected turn – the seven-continent model has been a mistake all along. Enter Zealandia, a long-lost land to the southeast of Australia, otherwise known as the planet's forgotten eighth continent. Scientists had long predicted the existence of this bonus southern landmass, but it remained missing for 375 years – largely because it’s almost entirely submerged under 1-2 km (0.6-1.2 miles) of water. Now they are beginning to unravel its secrets.
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This month, an international team of researchers released the most detailed maps of Zealandia to date – incorporating all five million square kilometres (two million sq miles) of this underwater region and its geology. In the process, they have uncovered hints as to how this mysterious continent formed – and why it has been obscured beneath the waves for the last 25 million years.
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Zealandia is thought to have formed around 83 million years ago, during the Late Cretaceous. However, its journey began up to 100 million years before that, when the supercontinent of Gondwana – which congealed much of today's land into one giant lump – started to break up. As it disintegrated, the world's smallest, thinnest and youngest continent struck out on its own, while the regions of Gondwana that had once laid directly to its north west and south west became Australia and Antarctica, respectively.
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