When did Australia become a continent?

Australia is not only the smallest continent but also the largest island on earth. But the land below is not always isolated; It was once part of a larger supercontinent. So when did Australia become its own continent?

Australia's Continental Land Activities About 2,300 miles (3,700 km) from north to south and 2,485 miles (4,000 km) from east to west. Within its 2.97 million square miles (7.69 million square kilometers), Australia is home to the oldest terrestrial resource on Earth: zircon crystals from the Jack Hills region of Western Australia, some 4.4 billion years old. According to a 2014 study in the journal Nature Geoscience.

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