The polished surface is the smooth and reflective area of the rock, created by glacial abrasion. The exposed granite refers to the non-polished part of the rock that is not covered by glacial ice.
In the photograph, the polished surface refers to the smooth and reflective area of the rock. This surface is the result of glaciation, where the movement of the glacier over the rock causes abrasion and wear, creating a polished appearance.
On the other hand, the exposed granite refers to the non-polished part of the rock that is not covered by glacial ice and is not reflective. It is the natural appearance of the granite bedrock.