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Glacial Erratics
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Erratics
What are they??
Erratics are rocks or boulders that are eroded and left behind by a glacier. Often, erratics are carried over thousands of miles before they are dropped.
Glacial erratics aren't actually formed. You could almost say they're stolen. Because a glacier is so heavy, the glacier can "steal" large rocks as it moves. When the rock is too heavy for the glacier to hold, or the glacier is retreating, it deposits the rock in a place where it wouldn't usually be found.
How are erratics formed??
Thanks for Watching
Big Rock, Okotoks, AB
The best way to know whether a boulder is an erratic or just a rock is to look at its surroundings. A glacial erratic is a boulder usually larger than the type of rock native to the area in which it sits now.
How do you know if a boulder is an Erratic??
Resources
https://nsidc.org/cryosphere/glaciers/gallery/erratics.html
http://www.answers.com/Q/How_do_glacial_erratics_form&altQ=How_are_glacial_erratics_formed&isLookUp=1#Q=how%20are%20glacial%20erratics%20formed
- The largest glacial erratic in the world is Big Rock in Okotoks.
- They show a general direction that a glacier has traveled.
Cool facts about Erratics
Erratic's from a glacier
By: Brielle & Riley