beach coast coastline color colored colors colour coloured colours green greenery growing growth layers levels ocean ocean-edge ocean-waterline plants rocks rocky rough scrub sea seashore seaside shade shadows shapes shore shoreline shrubbery shrubs Sizes stones stony sunlight sunshine surface surfaces surfacing textured textures tidal tide tides trees varied variety water builders' rubble dumped low tide mangroves natural outcrop pebbles pollution receding tide rock formations rubble sand waste waterline adults children distance distant expanse families light open area people recreation relaxing strolling sunset waders wading walking accumulations algae attached clinging covered ebb-and-flood ebb-and-flow filamentous holdfasts low-tide pounding seaweed slimy slippery spray sticking stuck surf surge surging velvety waves wet footprints industrial activity industrial area Jetty prints receding sandy ships