Rectangular iceberg floating in Antarctica spotted by NASA

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Larsen A, an ice shelf farther north on the peninsula, broke up in 1995. Such non-conventional icebergs can be massive, with the record-setting 11,000 square kilometer Iceberg B-15, visible from space, spotted off the Ross Ice Shelf in Antarctica in 2000.

NASA's ongoing, decades-long survey of polar ice has yielded some truly incredible photographs over the years, but one recent still captured what appears to be a perfectly, nearly impossibly rectangular iceberg.

Usually, when we think of icebergs, we don't imagine flawless geometric shapes.

The study is the largest airborne survey of Earth's polar ice ever flown, taking 3-D images and keeping track of sea ice thickness.

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Scientists from Project MIDAS - a British Antarctic Survey project involving researchers from several British universities - said past year that they feared the entire ice shelf could become unstable.

A NASA spokesman said: "It will yield an unprecedented three-dimensional view of Arctic and Antarctic ice sheets, ice shelves and sea ice". We get the type that everyone can envision in their head that sank the Titanic, and they look like prisms or triangles at the surface and you know they have a insane subsurface.

But NASA ice scientist Kelly Brunt explained the process that caused it is fairly common.

It's described as a "tabular iceberg" - with steep sides and a flat top, typically formed by "snapping off" from an ice shelf, experts say.

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"What makes this one a bit unusual is that it looks nearly like a square", she said.

"You can see at between 7-12 July 2018 the weather conditions and ocean currents conspire to swing the trillion tonnes of the giant iceberg A68 in an anticlockwise direction", he said.

"Sea ice conditions have kept a lot of them near Bawden Ice Rise".

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