Grinding and gouging'?
Ask your pupils:
• what will happen when they rub a clean ice cube on the piece of painted wood?
• what will happen when they rub a sand-covered ice cube on the piece of painted wood?
Carry out the activity by asking the pupils to rub a clean ice cube over the wood, pressing down as hard as possible. Next, ask them to press an ice cube on to some loose sand in a dish for about 15 seconds and then rub this over the wood. Are the results as predicted?
ELI activities about erosion by rivers, the sea and wind can also be found on our website. Use the topic search or search engine to find them.