Which event is decisive in changing a coastal arch into a sea stack?
Answer and explanation
Correct answer: Collapse of the arch roof
The governing process is marine erosion of a resistant rocky coast. Waves enlarge cracks and caves until a cave breaks through to form an arch; continued undercutting weakens the arch roof. When that roof collapses, the formerly connected rock is separated from the headland and remains as an isolated sea stack. Therefore option A is correct. Delta silt, river base level, and sinkhole water are unrelated processes.
Frequently asked questions
What is the correct answer to this question?
Collapse of the arch roof
Why is this the correct answer?
The governing process is marine erosion of a resistant rocky coast. Waves enlarge cracks and caves until a cave breaks through to form an arch; continued undercutting weakens the arch roof. When that roof collapses, the formerly connected rock is separated from the headland and remains as an isolated sea stack. Therefore option A is correct. Delta silt, river base level, and sinkhole water are unrelated processes.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting.
