# Massive calving of a glacier. Questions.

**URL:** <https://boards.straightdope.com/t/massive-calving-of-a-glacier-questions/713962>\
**Category:** Factual Questions\
**Created:** [March 1, 2015, 11:23pm UTC](https://boards.straightdope.com/t/massive-calving-of-a-glacier-questions/713962 "2015-03-01T23:23:40Z")\
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**Author:** ![Cartooniverse](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/cartooniverse/32/3084_2.png) [@Cartooniverse](https://boards.straightdope.com/u/Cartooniverse)\
**Post date:** [March 1, 2015, 11:23pm UTC](https://boards.straightdope.com/t/massive-calving-of-a-glacier-questions/713962/1 "2015-03-01T23:23:40Z")

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Please watch this [video of the largest and longest calving of a glacier ever recorded on video.](http://www.reshareworthy.com/cameras-capture-stunning-glacier-retreat/#mM7ziut5ZouEdRzE.01). It’s only about 4 minutes long.

Could an expert in this field explain this video, most notably the last 1-2 minutes that show the map of receding ice, and the years it took for ice to recede.

My wife and I are discussing this and it seems that the brief narration does not NEARLY explain what the map means. What the depth of the ice was in 1900, what the depth was in 1990, what it is now. It APPEARS that the ice is receding out towards the ocean on the right, slowly pulling out from its intrusion into/ onto land mass.

But… someone please explain what this map is really telling us?

I get the part where lower Manhattan has disappeared in a roiling mass of chaos. Got that. Amazing video with perspective. But the map and data shared at end of the video need explanation.

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