The feature resulting from a glacier carving out rock as it moves is called a glacial valley.

Here's why:

* Glaciers are powerful agents of erosion: Their immense weight and slow, grinding motion can carve out deep, U-shaped valleys in the landscape.

* U-shaped valleys are distinct: They differ from the V-shaped valleys created by rivers. The characteristic U-shape arises from the glacier's erosive power across the entire valley floor, not just at the bottom.

Other features resulting from glacier carving include:

* Cirques: Bowl-shaped depressions at the head of a glacial valley.

* Aretes: Sharp ridges separating glacial valleys.

* Horns: Pointed peaks formed by the intersection of several cirques.

* Fjords: Deep, narrow inlets formed by glaciers that have retreated.

Let me know if you'd like to learn more about any of these features!