https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4023046
Hubbard Glacier Alaska.
The Hubbard Glacier is an active glacier with two major surges in the last 30 years, at one point advancing more than 7 feet a day. These surges were large enough to threaten the nearby coastal town of Yakutat, and they almost blocked the entrance to Russell Fiord, notes Alaska.org. Large chunks of the glacier break off into the ocean on a regular basis. This process is known as calving. Most tidewater glaciers calve above sea level, causing huge splashes as the new icebergs strike the water. If the water is deep enough, glaciers can calve under water. Original public domain image from Flickr
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