IOWA??STATE??(US) ?????Radio??car??bon data from clam shells are telling the story of the Atlantic Ocean???s past.
Off the coast of Maine, clams can live up to 240 years, year after year adding anoth??er band to their shells, just like a tree adds anoth??er growth ring. In the cold??er waters of the North Atlantic near Ice??land, the clams can live up to 500 years, record??ing even more infor??ma??tion in what sci??en??tists call annu??al shell incre??ments.
Old clam shells act like ocean sensors