'Rocks from the big screen'. Use the suggestions in this activity to prepare pupils for an outdoor visit to a rock exposure in your own locality. If projection equipment and a large screen are available, project a photograph of a rock face (as shown above, or use one of your own). Ask pupils to pretend that they are looking at the actual rock face. Place some appropriate rock specimens on the floor below the screen, as though they had fallen from the rock face. The pupils now identify the pieces of rock, draw a scaled diagram (field sketch) of the photo and then work out the geological history.
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