Neco 2017 Geography Question 38

Practice objective / multiple choice question 38 from the 2017 Neco Geography examination.

Neco 2017 Geography Objective / Multiple Choice Medium Difficulty
Question 38 NECO • 2017 • GEOGRAPHY • objective

A V‑shaped river valley has a top width of \(80\) m and a depth of \(30\) m. Assuming the valley sides are straight and symmetrical, determine the angle that each side makes with the horizontal (in degrees, to two decimal places). If the river erodes the valley vertically at a constant rate of \(0.5\) mm per year, after how many years will the valley depth double? Provide the angle and the number of years.

Answer Options

A. Angle ≈ 45.00°; years ≈ 80 000.
Correct Answer B. Angle ≈ 36.87°; years ≈ 60 000.
C. Angle ≈ 30.00°; years ≈ 45 000.
D. Angle ≈ 33.69°; years ≈ 70 000.
Correct Answer
B
Correct Option:
Angle ≈ 36.87°; years ≈ 60 000.

About This Question

This is Neco 2017 Geography Question 38. It is one of the objective questions from the 2017 Neco Geography examination.

Difficulty level: Medium .

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