Explain how a U-shaped valley is formed. Explain what hanging valleys, truncated spurs, ribbon lakes and fjords are, their features and how they are formed.
Answers
Answer:
fjords are, their features and how they
Answer:
U-shaped valleys have steep sides and a wide, flat floor. They are usually straight and deep.
Explanation:
They are formed in river valleys which, during the ice age, have been filled by a large glacier. These glaciers have deepened, straightened and widened the valley by plucking and abrasion.
A hanging valley is a smaller side valley left 'hanging' above the main U-shaped valley formed by a tributary glacier.
A waterfall can often be seen. During glaciation the smaller side valley contains less ice than the main glacial valley, which is why it is not as deeply eroded.
Truncated spurs are rounded areas of land which have been cut off. A spur is a narrow neck of highland which extends into a river valley. It often forms the divide between two tributaries. They are often rounded at the top but steep at the bottom. They are formed when glaciers move through the main valley and cut off spurs.
A ribbon lake is a large, narrow lake occupying a U-shaped valley. It forms in a hollow when a glacier has more deeply eroded less resistant rock or it may fill up a valley behind a wall of moraine across the valley.