periglacial landforms

Scree slopes-relict feature

• slopes composed of large quantites of rock fragments
• freeze thaw in mountain sides splits rocks which fall down the mountain side
• rocks build up until the slope reaches an angle of 35 degrees (angle of rest- when rocks can no longer build up)
• the slope is then coverd in vegetation

patterned ground

• paving of ground into shapes like garlands, polygons, and stripes.
• can range from a few centimetres to 100 metres in size
• polygons common on flat ground and stripes common on slopes of 5-30 degrees
• frost heaving moves larger stones to the surface.
• fine grains form the core of the pattern and larger stones form the edges of the pattern.
• this creates a series of ploygon shapes

Pingos

• isolated domed hills upto 100m high and 1km in diameter
• water freezes under the pressure of being underground
• 2 types open pingos and closed pingos
• open pingos- water collects in a valley bottom in a talik (areas of unfrozen permafrost) and is trapped by freezing, when the tulik is frozen. this causes the ice…