Rocky crags are a type of landform that is characterized by steep and rocky cliffs. They are often found in mountainous regions and can be composed of various types of rock, such as granite or limestone. The term 'tors' is used to describe these rocky crags, which are typically isolated hills or ridges with steep sides and a flat top. Tors are formed by the erosion of the underlying rocks, which can be caused by wind, water, or ice.