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Geophysical data suggest that a region spanning 5 million square kilometers, which includes New Zealand and New Caledonia, is a single, intact piece of continental crust and is geologically separate from Australia.
The rift gave Zealandia its independence, but it also pulled and thinned the crust, causing the area to sink, and dooming most of it to a watery existence. Today, only about 6% of it remains above water, as New Zealand and New Caledonia.
