Ocean Acidification is a 4 page Claim - Evidence - Reasoning (CER) lab design used to support students critical thinking, problem solving skills, and NGSS skills. Students use seashells and chalk to represent coral reefs and vinegar to represent ocean acidification. Students observe, model, research, make a claim, provide evidence, and reasoning for the experiment. Lab takes 3 days to really see the results but can take longer to further see the effects of acids on calcium carbonate. Includes an