A “rauk” is a rock formation formed by abrasion. Abrasion is a mechanical process created by the friction of smaller particles moving against a rock. The rauks are created when the surrounding sea erodes rock rising out of the sea due to the land uplift. This mechanical process of sea erosion only leaves a solid core of limestone. Rauks are common along the coast of the island of Gotland but can also be found on the island of Öland.

image source: http://mapio.net/pic/p-23729186/
made by: natural phenomena
material: limestone
process: abrasion