aerial aerial roots beach coast coastline colors colours growing growth layers levels low tide mangrove growth mangroves natural ocean ocean edge ocean waterline pebbles plants receded receding receding tide rocks rocky root network Roots rough salt-resistant sand security strength strong support tidal tides water waterline aquatic Busycon carica dextral gastropod gastropod shell knobbed whelk marine marine gastropod molluscs migratory mollusk mollusks sea Sea snail sea snails sea-snail seasnail shell Shell on the beach shore splash wave welk whelk above air altitude bay canada forest height high inlet island nature pacific rock trees vancouver algae cliff Cornish cornwall England english Great Britain holiday leisure resort sandy seaweed surf tide vacation waves cartoon child clip art clipart fun girl graphic illustration kids life lifestyle outdoors play recreation stick children stick kids whimsical arctic blue dunes green Lofoten Islands mountains norway norwegian pleasure relax summer view white sport surfers boulders clifftop hard headland hillside