Evaluation: Ask the students what they thought of the tsunami hitting the tissue village. Is this what they expected? Why did the tissue buildings fail so easily? What else do you observe?
II. Cardstock tsunami test. Perform the tsunami test again, this time with the students who built the cardstock buildings. In this scenario, students observe that some buildings move slightly, but overall the cardstock village survives better than the tissue village. Note: After several waves the sand erodes slightly, so build up the continental shelf and beach with more sand, as needed.
III. Notebook paper buildings, toothpick stilts tsunami test. Perform the test yet again, with the students who built the notebook paper buildings with toothpick stilts. Make sure students just set the stilted buildings on the sand and do not push the toothpicks all the way into the sand (see Figure 7).