Neco 2020 Geography Question 29
Practice objective / multiple choice question 29 from the 2020 Neco Geography examination.
In a hill composed of alternating layers of granite (2\,m thick) and basalt (1.5\,m thick), the chemical weathering rate of granite is 0.5\,mm per 100\,years and the physical weathering rate of basalt is 1.2\,mm per 100\,years. Assuming the rates apply uniformly, after how many years will the total thickness of the hill be reduced by 10\%? Round to the nearest whole year.
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About This Question
This is Neco 2020 Geography Question 29. It is one of the objective questions from the 2020 Neco Geography examination.
Difficulty level: Medium .
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