background coast colors colours Cornish cornwall England english eroded erosion Great Britain natural nature pebbles pool rocks smooth stones texture underwater water worn algae blue coastline Lofoten Islands low mountains norway norwegian ocean plant rockpool sand sea seaweed shore tide view active cloud danger geothermal geothermally hot lake Mineral new zealand red Rotorua toxic vapor vapour bug dragon dragonfly flight fly green insect large lily lily-pad pad pond wings burst fields flood gate grass landscape meadows river spate Sussex trees winter early mist Morning peaceful reflection rise rising spring bathing channel ground Maori steam village