Students learn How the Tongan Eruption Happened through a C.E.R. (Claim Evidence Reasoning) graphic organizer. This is great for getting your students to explain phenomena in a meaningful way and it allows you as the instructor to adequately assess their understanding of concepts. The students figure out what the "Claim" is in the article, they then use data that supports the claim in the "Evidence" section, draw visual evidence and then explain why the evidence supports the claim in the "Reason