A plateau covers an area of 150 km² and is eroded at an average rate of 0.25 mm per year.

(a) What uplift rate (in mm per thousand years) is required to exactly balance the erosion?
(b) If the actual tectonic uplift is 0.15 mm per year, state whether the plateau is net eroding or building up and by how many millimetres per year.

Question

A plateau covers an area of 150 km² and is eroded at an average rate of 0.25 mm per year.

(a) What uplift rate (in mm per thousand years) is required to exactly balance the erosion?
(b) If the actual tectonic uplift is 0.15 mm per year, state whether the plateau is net eroding or building up and by how many millimetres per year.

Accepted Answer

(a) 250 mm/kyr; (b) net erosion of 0.10 mm per year

Gce Model Questions Vol1 2025 Geography Question 20

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