How are perfectly rectangular icebergs formed?

In October, NASA scientist Jeremy Harbeck spotted two almost perfectly rectangular icebergs that broke off of the Larsen C ice shelf in Antarctica. These tabular icebergs have a flat top and hard corners, indicating that they were recently formed.

Bibliographic Details
Main Author: Lieser, JL
Format: Text
Language:English
Published: http://www.businessinsider.com/sai 2018
Subjects:
Earth Sciences
Physical Geography and Environmental Geoscience
Glaciology
Flat Top
Jeremy
Antarc*
Antarctica
Ice Shelf
Online Access:https://www.youtube.com/watch?v=Aw-SIn5E2Cs
http://ecite.utas.edu.au/129185
Description
Summary:In October, NASA scientist Jeremy Harbeck spotted two almost perfectly rectangular icebergs that broke off of the Larsen C ice shelf in Antarctica. These tabular icebergs have a flat top and hard corners, indicating that they were recently formed.

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