Pupils are shown a photograph of a straight valley, a simple landform. They are given a very simple geological map of such a landform, with
horizontal beds. They are asked to draw topographical cross sections of the valley, adding the geology to produce geological cross sections.
As the cross-section drawing progresses, it involves more interpolation and more three-dimensional thinking skills. Pupils will realise that all the geological boundaries and therefore all the beds are horizontal. This will allow them to complete the 3D block diagram successfully.
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