Why does soil get washed away?

Set up two trays as shown in the photo. Ask the pupils which tray they expect the soil to be washed away from more quickly. Carry out the activity - click here for a free download. Are the results as expected? What do the pupils think can be done to protect soil from erosion?
Have you tried soil painting? Click here to see some examples.
All Earthlearningidea activities can be seen on our website. We should be pleased to receive your comments about this or any of the ideas, either via this blog or by email.