Neco 2017 Geography Question 7

Practice essay / theory question 7 from the 2017 Neco Geography examination. This question covers Landforms, Erosion, Slope .

Neco 2017 Geography Essay / Theory
Topics: Landforms Erosion Slope
Question 7 NECO • 2017 • GEOGRAPHY • essay

A topographic map of a plateau region in Nigeria shows two prominent hills, Hill X and Hill Y. The contour interval on the map is 20 m. The summit of Hill X is at 460 m above sea level and the summit of Hill Y is at 340 m above sea level. The straight‑line distance between the two summits is 6 km. A river originates at the foot of Hill X and flows to the foot of Hill Y, following a meandering course whose length is 8 km. The vertical drop of the river from its source to its mouth is 120 m. The average rate of vertical erosion by the river is estimated at 0.5 mm per year.

Question Parts

( a )
Calculate the average gradient (in %) of the straight line joining the summits of Hill X and Hill Y.
( b )
Calculate the average gradient (in %) of the river course from its source to its mouth.
( c )
Using the gradients obtained in parts (a) and (b), discuss which of the two landforms – the ridge joining the hills or the river valley – is more susceptible to weathering and erosion, giving at least two reasons for each landform.
( d )
Estimate the number of years required for the river to erode a vertical depth of 30 m, assuming the erosion rate remains constant at 0.5 mm per year.

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About This Question

This is Neco 2017 Geography Question 7. It is one of the essay questions from the 2017 Neco Geography examination.

The question covers Landforms, Erosion, Slope .

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