When is river avulsion more likely?
Answer and explanation
Correct answer: When a river flows in an elevated channel built by its own deposits and finds a shorter, lower-gradient route
Avulsion is the relatively sudden abandonment of an established river channel in favour of a new course across a floodplain or delta. Repeated deposition can raise the channel bed and natural levees, making the old route hydraulically less efficient. During a flood, water may breach the bank and occupy a shorter or steeper path. Option A expresses this setting; the other options are unrelated to channel switching.
Frequently asked questions
What is the correct answer to this question?
When a river flows in an elevated channel built by its own deposits and finds a shorter, lower-gradient route
Why is this the correct answer?
Avulsion is the relatively sudden abandonment of an established river channel in favour of a new course across a floodplain or delta. Repeated deposition can raise the channel bed and natural levees, making the old route hydraulically less efficient. During a flood, water may breach the bank and occupy a shorter or steeper path. Option A expresses this setting; the other options are unrelated to channel switching.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Bills of Exchange. Topic: Important Terminology.
