What tendency is more likely in the lower course when sea level rise increases the river base level?
Answer and explanation
Correct answer: Aggradation and deposition near the mouth
Base level is the lowest level to which a river can normally erode its channel. When sea level rises, the river’s gradient and erosive energy in its lower course generally decrease. The reduced transport capacity encourages sediment to accumulate, producing aggradation and deposition near the mouth. Rapid gorge downcutting indicates renewed erosion, while cirques and yardangs are glacial and wind-made landforms, respectively. Therefore, option A is correct.
Frequently asked questions
What is the correct answer to this question?
Aggradation and deposition near the mouth
Why is this the correct answer?
Base level is the lowest level to which a river can normally erode its channel. When sea level rises, the river’s gradient and erosive energy in its lower course generally decrease. The reduced transport capacity encourages sediment to accumulate, producing aggradation and deposition near the mouth. Rapid gorge downcutting indicates renewed erosion, while cirques and yardangs are glacial and wind-made landforms, respectively. Therefore, option A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
