2 - Glaciated Uplands Flashcards
WHAT IS PLUCKING?
when the glacier freezes onto the underlying landscape and rips them out as it moves downhill due to the force of gravity. This then provided material for abrasion.
WHAT IS ABRASION?
rocks plucked get frozen in the base of the glacier and scour away the underlying landscape as it moves, having a sandpaper effect. It also leaves scratches on the underlying surface called striations.
WHAT IS FREEZE-THAW WEATHERING?
this is a process of weathering that occurs in upland areas. Water enters cracks in rock and expands as it freezes. This widens the crack and when repeated it eventually breaks off pieces of rock.
WHY DO GLACIERS MOVE DOWNHILL?
gravity
WHEN DOES A CORRIE FORM?
Snow gathers in a north facing hollow and compresses under its own weight to form ice.
WHAT IS A CORRIE?
Once the ice has melted a deep, steep sided horseshoe shape hollow remains called a corrie.
EXAMPLE OF A CORRIE
Coire Cas
WHEN DOES AN ARETE FORM?
Two corries form back to back on a mountainside as glaciers move downhill due to gravity.
WHAT IS AN ARETE?
As each glacier erodes into the mountain, a steep, narrow ridge called an arete forms between them.
Once the ice has melted, freeze-thaw weathering continues to give it a jagged appearance.
EXAMPLE OF AN ARETE
Fiacaill a Coire Cas
WHEN DOES A PYRAMIDAL PEAK FORM?
Three corries form around a mountainside as glaciers move downhill due to gravity.
WHAT IS A PYRAMIDAL PEAK?
As each glacier erodes into the mountain, a sharp pointed peak called a pyramidal peak forms between them.
EXAMPLE OF A PYRAMIDAL PEAK
Angels Peak
WHEN DOES A U-SHAPED VALLEY FORM?
A glacier moves downhill through a V-shaped valley due to gravity.
WHAT IS A U-SHAPED VALLEY?
Once the ice has melted, a u-shaped valley remains with steep sides and a wide, flat base.
A misfit stream or ribbon loch are also found on the valley floor.