The process you're describing is called plucking. Here's a breakdown:

* Glacier Melt: As the base of a glacier melts, water seeps into cracks and crevices in the bedrock beneath it.

* Freezing and Expansion: When this water freezes, it expands, putting immense pressure on the rock.

* Rock Removal: This pressure can eventually be strong enough to break off pieces of the bedrock, which become embedded in the ice.

* Transportation: As the glacier moves, it carries these plucked rocks along with it, transporting them to new locations.

This plucking process is a key factor in glacial erosion, shaping landscapes and creating unique geological features.