Question
Describe how a glacial trough is formed.
Answer
- Initially there is a main river valley and several tributary river valleys.
- Once glaciations occurs, ice collects and moves in both the main valley and in the tributary valleys.
- Moving ices erodes the valley through abrasion and plucking processes.
- As the tributary valleys join the main valley the amount in the main valley increases.
- The main valley becomes deeper and wider resulting in a U-shaped, steep sided valley called a glacial trough.
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