In Investigate 3 we created a model of erosion, but this time we added a few large rocks to represent hills or small mountains. The picture shows the layout of the rocks before the experiment. The students had to create a map showing the rock placement before the experiment.
Here is the experiment. Notice that the erosion this time was much more focused along a single path, and the water eroded much more of the soil this time. Unfortunately, I did not manage to make the soil as flat this time as the last and that did help guide the water, but it is a mystery why there was so much more erosion. Do you have any ideas why this happened?
At the end of the demonstration the students were required to show the flow of water on their maps.