A decrease in particle size away from the source on an alluvial fan shows which principle?
Answer and explanation
Correct answer: Selective deposition and decreasing energy
As a stream leaves a confined valley and spreads across an alluvial fan, its gradient, depth and transporting power generally decline. The largest, heaviest clasts are deposited close to the fan apex; progressively finer sediment can be carried farther outward before settling. This is sorting by selective deposition caused by decreasing flow energy. Therefore option B is correct, while the other choices involve coastal, karst or glacial processes.
Frequently asked questions
What is the correct answer to this question?
Selective deposition and decreasing energy
Why is this the correct answer?
As a stream leaves a confined valley and spreads across an alluvial fan, its gradient, depth and transporting power generally decline. The largest, heaviest clasts are deposited close to the fan apex; progressively finer sediment can be carried farther outward before settling. This is sorting by selective deposition caused by decreasing flow energy. Therefore option B is correct, while the other choices involve coastal, karst or glacial processes.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Theory Base of Accounting. Topic: accounting principles.
