1. Periglacial processes and landforms Pgs 145-151

13. 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

14. Europe’s Loess Belt C Loess

15. 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

16. The End!