A large iceberg has broken off the Brunt Ice Shelf in Antarctica, the British Antarctic Survey (BAS) research organization has said. The iceberg, measuring 380 square kilometres, broke off on Monday weeks after a 14-kilometre crack opened up in the ice. The calving – the scientific term for the separation of ice chunks from a glacier or ice mass – was the third in the region in the past four years. BAS scientists identified instabilities in the area more than a decade ago, resulting in the British research station Halley being moved 20 kilometres inland in 2016. BAS researcher Oliver Marsh sai…