The clip provides a useful starting point to discuss the variety of rocks, their existence and their uses. Pupils could list the rocks they recognise in the clip and construct a table recording the rock and its use in everyday life eg marble - building, kitchen surfaces (if possible,' real' examples of the rocks could be provided so the children can explore the materials first-hand). Groups could share their findings and discuss why certain rocks are used for one particular purpose eg slate and marble are used for building because they are waterproof, readily available and attractive. A decision-making task could be presented to the children, where they are given a scenario and have to choose the best rock for the task, supporting their decision with scientific reasons eg the school wants to build a statue in the grounds to commemorate 100 years of existence. Which rock should it be constructed from? If the school want to design a commemorative mug what rock should they use and why?