The turquoise waters of an Ocean swell steadily rise and fall in a small gap in rocks on the edge of a sea cliff covered in bladder wrack seaweed

tidal rock pool sea seaweed nature ocean diversity salt salty intertidal rocks slippery slimy wet bladder wrack atlantic sea grapes fucus vesiculosus seawater shore rocky intertidal zone saline dynamic habitat ecology handa island scotland barnacles floating buoyant swell crashing waves wave swelling building power motion turbulent powerful tide tides acceleration float ebb and flow current tidal power rise and fall