Glaciated uplands Flashcards
What is a glacier?
A glacier is formed as rainfall collects between mountains and turns to snow. The weight of the snow then compressed it into ice. The ice is weighed down by gravity which causes it to move and when the ice melts, it changes the shape of the landscape. Rounded hills are turned into steep sided mountains and V-shaped valleys turn to U-shaped valleys.
Glaciated uplands
North west highlands Grampian mountains/ Cairngorms Loch Lomond Lake District Snowdonja
Physical weathering: Freeze thaw action
- Water collects in the rock crack
- Water freezes and expands/ forcing crack to widen
- ice contracts and water gets deeper into cracks again
- repeated expansion and contraction causes further erosion until the rock splits
Methods of erosion
Plucking: the ice freezes onto rocks and when the ice moves downhill, pieces of rock from the mountain break off with it and go downhill
Abrasion: the pieces of rock broken off from plucking and freeze thaw weathering scrape against the side of the glacier, wearing it away
Formation of a u shaped valley
Before glaciation:
- Before glaciation a river runs through s v shaped valley
- snow will accumulate in valley during glaciation period
- snow is compressed into ice to form a glacier
During glaciation:
- As glacier moves through the valley it erodes the land by abrasion and plucking
- Over time the valley is straightened, widened and deepened
Formation of a u shaped valley: after glaciation
- When ice melts, u shaped valley is left with steep sides and wide/ flat valley floor
- When ice melts a river may flow through valley but is too small for the very wide valley floor so it is called a misfit stream
Alluvial fan
A fan shaped pile of rock remains washed down by a stream and piled up where a steep valley side meets the valley floor
Truncated spur
Rounded areas of land which have been cut off. They are often rounded at the top but steep at the bottom
Hanging valley
A valley where the valley floor is much higher than the floor of the main valley
Ribbon lake
A long narrow lake in a part of the valley cut deeper by the glacier
Misfit stream
Small stream flowing through the valley because it is too small to have cut the valley
Land uses in glaciated uplands
Renewable energy Recreation and tourism Water storage and supply Farming Industry Forestry
Renewable energy
- Wind farms and hydroelectric power (HEP)
- HEP is usually in hanging valleys and they’re dammed to generate electricity using the force of water from rivers
- The strong winds on higher lands can also provide an opportunity to generate wind energy
Recreation and tourism
- Natural picturesque scenery and variety of year round activities
- ribbon lakes for water sports
- corries for winter sports
Water storage and supply
- High rainfall ensures that lakes in this region can be used to supply drinking water to nearby towns and cities
- the hard rocks provide excellent geological conditions for water storage in reservoirs