The Arctic has features of both glacial and periglacial processes. Some areas of the Arctic are permanently frozen and have glaciers in the highland areas and ice sheets. In other areas the surface layer of the ground thaws during the summer (the active layer) while deeper layers are permanently frozen (permafrost) resulting in different features.
Northern Lights - Karasjok - Norway
Collisions between electrically charged particles from the sun that enter the earth's atmosphere.
Glacial processes
Some parts of the Arctic are permanently frozen, all year round.
Periglacial processes
Some parts of the Arctic are only frozen in winter.
Ice sheets and glaciation
In the Arctic, more than 90% of the land ice is found in Greenland.