How to Make a Seashell - Just Add Water!
Key Facts In This Video
Sea snails build their shells by pulling calcium and carbonate out of the surrounding water, forming solid calcium carbonate. (0:06)
The upper part of the ocean is saturated with calcium and carbonate, which is why it's ideal for shell-building. (1:15)
An excess of CO2 from the atmosphere can change the dissolving depth at which shells break apart. (2:21)