THE INCREDIBLE PINK SAND BEACHES OF BERMUDA

Beach sand is not volcanic but from finely pulverized remains of calcium carbonate shells and skeletons of invertebrates such as corals, clams, forams and other shells. Beaches begin with tiny single-celled animals, Foraminifera, in particular, homotrema rubrum - or forams - dark red skeletal animals that grow profusely on the underside of Bermuda's coral reefs. When the red forms die, the skeletons plummet to the ocean floor. Wave action erodes the forams. They become mixed with other debris on the seabed such as the white shells of clams, snails and sea urchins.