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Another large iceberg recently broke off Pine Island Glacier Antarctica.

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According to the U.S.

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National Ice Center this iceberg named B-46 has an area of 87 square miles.

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Thats slightly larger than the iceberg that previously separated from the glacier in September 2017.

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B-46 broke away on October 29 2018 just a month after a rift first appeared.

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The October 1 image acquired by Landsat 8 shows the beginning of the rift.

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Iceberg calving is natural part of glacial change but these large breaks are happening more

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frequently on Pine Island Glacier.

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Since 2013 the glacier has calved four large icebergs.

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A Landsat 1 image from 1973 compared to 2018 shows the glaciers retreat over 45 years.

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