Just off the coast of northeastern Scotland is a large arch called Bow Fiddle Rock. The 50-foot-tall rock formation was named for its resemblance to the tip of a bow used to play a fiddle or a violin. Bow Fiddle Rock formed over the course of millions of years of natural erosion. It is part of the Cullen Quartzite formation, a stretch of metamorphic rock found along this part of the Scottish coast. Originally, the rock would have been sandstone layered under the sea. Over millions of years, sediment built up…