Hi,
Just a thought but if you can plan for the longer term you could involve pupils in creating an experiment which leads to a dig. Collect objects from today made from a range of different materials and bury them at an agreed level in the raised bed. Get the pupils to lay the objects out, photograph them, measure their location in relation to a fixed point and then carefully bury them. Ask pupils to predict what will survive in the ground and what may disappear. You can then excavate these in a few months time and see what has survived and what has gone. The experiment could be repeated lots of times if rather than move the objects when they are uncovered you photograph them and measure their position again before reburying and would give them an understanding of the techniques used by archaeologists and the challenges of understanding the past from archaeological artefacts when only a very small percentage of what has been deposited will survive. If you included for example, a newspaper, clothes with a metal zip and objects made from metal, clay, plastic and wood you would get a good range of survival. Small items may be hard to find again and may have been moved by animals and worms so lots of different challenges could be introduced. By involving pupils from the start you would avoid any confusion about what they are digging up.
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