Sign the name of the continent and the largest island on Earth, the territory of which is completely

Sign the name of the continent and the largest island on Earth, the territory of which is completely covered with glaciers. How can this natural phenomenon be explained?

If, to follow the logic, then the only continent on planet Earth that is covered with ice is Antarctica. It is located at the bottom of the map (I wrote it to make it clear). And the largest island in the world is Greenland, which is also covered with ice. Located in the Western Hemisphere, at the top of the map.
Direct sunlight does not hit the surface of these objects, which is why glaciers are formed there.