How do glaciers abrade rocks?

no a glacier is not a rock, it's ice

No, it is composed of ice which though solid is not considered a rock. They often transport rocks cast off by the mountain.

Glaciers could be thought of as super rock eroders. They break up the rocks and push them with the ice down hill.

The glacier can carry rocks. The moving of the glacier.

They can. because, glaciers pick up sediment as they go along slowly.