UPSC Exam > UPSC Questions > Consider the following statements. 1. If rej...
Start Learning for Free
Consider the following statements.
1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed.
2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders
Which of these statements are not correct?
- a)1 only
- b)2 only
- c)Both of them
- d)Neither of them
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Consider the following statements. 1. If rejuvenation occurs in the u...
- If rejuvenation occurs in the upper course, the river valleys are deepened and steep-sided gorges are formed.
- In the middle and lower course vertical corrasion replaces lateral corrasion and the existing meanders are vertically eroded by the rejuvenated stream.
- A distinct new inner trench is cut in the old valley, and the river develops a deep valley with entrenched or incised meanders.
Most Upvoted Answer
Consider the following statements. 1. If rejuvenation occurs in the u...
Statement 1: If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed.
Rejuvenation refers to the process by which a river resumes its downward erosion after being temporarily uplifted. This can occur due to tectonic activity or changes in base level. When rejuvenation occurs in the upper course of a river, it can lead to several changes in the landscape:
- Increased vertical erosion: The river starts cutting down into the bedrock, deepening the river valley. This results in the formation of steep-sided gorges as the river erodes the surrounding rock.
- Formation of waterfalls and rapids: As the river cuts through harder rocks, it may encounter resistant layers that create barriers to its flow. This leads to the formation of waterfalls and rapids as the water plunges over these barriers.
- Formation of incised meanders: The river may also develop incised meanders, which are meandering channels that are deeply entrenched into the landscape. This occurs as the river cuts down into the bedrock, carving out a deeper channel.
Therefore, statement 1 is correct as rejuvenation in the upper course can indeed deepen river valleys and form steep-sided gorges.
Statement 2: In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders.
In the middle and lower course of a river, lateral erosion is the dominant process. Lateral erosion refers to the sideways erosion of the river channel, which leads to the formation of meanders. However, when rejuvenation occurs in the middle or lower course, vertical erosion can replace lateral erosion and lead to changes in the landscape:
- Vertical erosion: The rejuvenated stream starts cutting down vertically into its bed, deepening the channel. This can occur due to changes in the base level or tectonic uplift.
- Abandonment of old meanders: As the river deepens its channel, the existing meanders may be abandoned and new ones may form. This is because the river is able to cut through the meander necks and straighten its course.
Therefore, statement 2 is also correct as vertical corrosion can replace lateral corrosion and the rejuvenated stream can vertically erode existing meanders.
Conclusion: Both statement 1 and statement 2 are correct. The correct answer is option 'D', which states that neither of them is incorrect.
Rejuvenation refers to the process by which a river resumes its downward erosion after being temporarily uplifted. This can occur due to tectonic activity or changes in base level. When rejuvenation occurs in the upper course of a river, it can lead to several changes in the landscape:
- Increased vertical erosion: The river starts cutting down into the bedrock, deepening the river valley. This results in the formation of steep-sided gorges as the river erodes the surrounding rock.
- Formation of waterfalls and rapids: As the river cuts through harder rocks, it may encounter resistant layers that create barriers to its flow. This leads to the formation of waterfalls and rapids as the water plunges over these barriers.
- Formation of incised meanders: The river may also develop incised meanders, which are meandering channels that are deeply entrenched into the landscape. This occurs as the river cuts down into the bedrock, carving out a deeper channel.
Therefore, statement 1 is correct as rejuvenation in the upper course can indeed deepen river valleys and form steep-sided gorges.
Statement 2: In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders.
In the middle and lower course of a river, lateral erosion is the dominant process. Lateral erosion refers to the sideways erosion of the river channel, which leads to the formation of meanders. However, when rejuvenation occurs in the middle or lower course, vertical erosion can replace lateral erosion and lead to changes in the landscape:
- Vertical erosion: The rejuvenated stream starts cutting down vertically into its bed, deepening the channel. This can occur due to changes in the base level or tectonic uplift.
- Abandonment of old meanders: As the river deepens its channel, the existing meanders may be abandoned and new ones may form. This is because the river is able to cut through the meander necks and straighten its course.
Therefore, statement 2 is also correct as vertical corrosion can replace lateral corrosion and the rejuvenated stream can vertically erode existing meanders.
Conclusion: Both statement 1 and statement 2 are correct. The correct answer is option 'D', which states that neither of them is incorrect.
Attention UPSC Students!
To make sure you are not studying endlessly, EduRev has designed UPSC study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in UPSC.
|
Explore Courses for UPSC exam
|
|
Similar UPSC Doubts
Top Courses for UPSCView all
Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer?
Question Description
Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer?.
Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC.
Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.
Here you can find the meaning of Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Consider the following statements. 1. If rejuvenation occurs in the upper course, the river valleys are deepened, and steep-sided gorges are formed. 2. In the middle and lower course vertical corrosion replaces lateral corrosion, and the rejuvenated stream vertically erodes the existing meanders Which of these statements are not correct?a) 1 onlyb) 2 onlyc) Both of themd) Neither of themCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice UPSC tests.
|
|
Explore Courses for UPSC exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup