What are these sharp,glacially carved ridges?

Name: What are these sharp,glacially carved ridges?
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Arêtes are sharp, glacially carved ridges that form between two cirques (bowl-shaped depressions found on a mountainside) as a glacier erodes the rock on either side. Hogbacks and razorbacks are also ridges, but they are formed through different geological processes (erosion by water and wind, respectively), while flatirons are triangular-shaped rock formations found at the base of a steep rock face.

What Are These Sharp,glacially Carved Ridges