Northern Lights - Karasjok - Norway
Collisions between electrically charged particles from the sun that enter the earth's atmosphere.
![](https://discoveringthearctic.org.uk/wp-content/themes/dta-theme/img/faux-5x3.png)
Glacial processes
Some parts of the Arctic are permanently frozen, all year round.
![](https://discoveringthearctic.org.uk/wp-content/themes/dta-theme/img/faux-5x3.png)
Periglacial processes
Some parts of the Arctic are only frozen in winter.