MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY MICHAEL SZOENYI / SCIENCE PHOTO LIBRARY
Coastal shell fragments. Shells are grown by many marine invertebrates for protection. These are the shells of marine molluscs, and are formed from nacre, a combination of proteins and calcium carbonate. After the animal dies, the shells are broken up by wave action and eventually contribute to the composition of coastal sands. This sample is from Kelleys Island, Lake Erie, USA.
Model release not required. Property release not required.