I have speculated that the fracturing as well of the melting of the Greenland ice sheet could lead to large area ice slide-offs? I am not sure how rough the und

I have speculated that the fracturing as well of the melting of the Greenland ice sheet could lead to large area ice slide-offs? I am not sure how rough the underlying terrain is, but I expect millions of years of abrasion by stone in ice might lead to this occuring in some areas? Ice is structurally weak, so any motion embodying fracture would break it into ice boulders/gravel - none of these scenarios look at all good - how likely are they?