Neco 2020 Geography Question 4

Practice objective / multiple choice question 4 from the 2020 Neco Geography examination.

Neco 2020 Geography Objective / Multiple Choice Medium Difficulty
Question 4 NECO • 2020 • GEOGRAPHY • objective

A river has cut a V‑shaped valley to a present depth of 150 m. The average vertical erosion rate measured from dated terraces is 0.5 mm yr\(^{-1}\). (a) Assuming the erosion rate has been constant, estimate how many years ago the river began incising the valley. (b) If the region is undergoing a uniform tectonic uplift of 0.1 mm yr\(^{-1}\), what is the net deepening rate and the revised estimate of the incising time?

Answer Options

A. Without uplift: 250,000 years; with uplift: 300,000 years
B. Without uplift: 200,000 years; with uplift: 400,000 years
C. Without uplift: 300,000 years; with uplift: 250,000 years
Correct Answer D. Without uplift: 300,000 years; with uplift: 375,000 years
Correct Answer
D
Correct Option:
Without uplift: 300,000 years; with uplift: 375,000 years

About This Question

This is Neco 2020 Geography Question 4. It is one of the objective questions from the 2020 Neco Geography examination.

Difficulty level: Medium .

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