Today felt like a Monday with having Veterans' Day off but it was nice to be back! We continued working on reviewing and preparing for Tuesday's test.
Then we did another brief review.
The students then did a diagram activity involving a more complex rock cycle. Then, we did the main activity.
I told them about the Law of Superposition. Most of the students looked at me as if I had sprouted an extra nose but I assured them that they knew about it. What is it? It simply means that the older sedimentary rock layers are the ones beneath the others. Or.....the further down you dig, the older the rocks gets since layers build up upon one another.
Today's activity was to simulate it using Play-Doh. Each student received a container and cut away one third of it to save the rest for the other classes. Of course, when my third block class did the activity, there was nothing to cut. They simply took the remaining third out of the container. This worked out quite well.
Each student flattened the piece of Play-Doh into a mass of roughly 1/4" thickness but it need not be that accurate. The flattened pieces were then cut into halves. So each group ended up with eight pieces in all.
Each piece represented a layer of sedimentary rock. The groups placed their layers in a stack in whatever order they preferred as long as two of the same colors were not next to each other.
The stacks were then mashed down to about half their original heights. The next step was to have the class switch their creations around so that each group had one that was different. Taking their plastic knives, they cut the pieces in half and examined each layer. They then drew in their notebooks what they saw and wrote a brief explanation/reflection piece about the Law of Superposition.