Stones in periglacial areas seemed to sort themselves out in to patterns. This is due to frost heaving.
The ice freezes underneath the stones which expand and pushes the stones upwards.
When they reach the surface they roll outwards.
Other Periglacial Processes and Landforms • Mechanical weathering by freeze-thaw is widespread. • Low temperatures, sparse vegetation cover and poorly developed soils reduce the likelihood of chemical and biological weathering taking place. • Lack of vegetation increases wind (aeolian) action. • Further erosion occurs as the wind-blown sand grains abrade rock outcrops. • Wind action produces semi-circular dunes of sandy outwash material. • It also produces wind-blown loess. • Loess is a fertile, easy to work soil. • A loess belt extends across Europe C
Artic Streams • The amount of transport and erosion in Arctic streams is also huge. • The high load comes from flowing over areas liberally covered by loose debris from glaciers. • The high discharge comes from melting ice. • 80% of the discharge comes in one or two months of the year. C