Oh my! I hadn’t been to visit the 4th grade class I volunteer with in about a month. I had a lot of travel and then Thanksgiving and just couldn’t pull it off. I finally got back up there yesterday and today to do an experiment to test effects of erosion.
Because I was going to lead students through designing an experiment and in the interest of time, I prepped materials ahead of time.
1.I cut 4 water bottles and filled them with the same amount of soil.
2. I put plants in one, large rocks in another, and gravel in the third. The fourth just had plain soil.
3. There were bowls at the end where the water and sediments empty out. The bowls had little holes in them to let water drain out more easily.
Set the Stage
Students already learned about weathering, erosion, and deposition. We briefly reviewed the terms and discussed the question we would be answering. “Which landscape allows sediment to erode most easily?”
Talk it Out
I led students through writing hypotheses and planning the experiment as a class. We made a materials list and looked at variables. They struggled a bit with variables, but a few really caught on to independent and controlled variables.
We made bar graphs of data using a technique I previously blogged about. Then, students formed a conclusion based on our data to answer the question.