Grand Canyon sand was photographed with hand-held point-and-shoot camera in underwater housing.
Bed sediment from the shelf of the Adriatic Sea was photographed with an autonomous tripod-mounted digital SLR camera. Top image shows sand silt and pellets; lower photo contains shell fragments.
Carbonate sand from surf zone in Kauai, HI, was photographed underwater with hand-held point-and-shoot camera in waterproof housing.
