Make a model of a sea shell in an ocean environment, and see what happens to it when the water becomes more acidic.
Seashells With Vinegar Ocean Experiment - Little Bins for Little Hands
Seashell Acid Base Experiment - Teach Beside Me
No more seashells on the seashore: How do we adapt to changing ocean chemistry? – Topics in Sustainable Fisheries
How Seashells Get Their Strength, News Release
Elevated temperature and carbon dioxide levels alter growth rates and shell composition in the fluted giant clam, Tridacna squamosa
How to Dissolve a Seashell – Beach Hands-on Fun Activity
Dissolve a Seashell Experiment – Squizzel Box
Seashell Acid Base Experiment - Teach Beside Me
Ocean acidification will eat away at the shells of abalone and other economically important shellfish species - Ocean Acidification
Catapult, What a Seashell Souvenir Tells Me About Loss