cliff drop fall force forest green melt natural nature norway norwegian power rock snow trees violent water waterfall mountain blue boulder coast coastline cyprus danger hazard horizon landscape mediterranean reef sea shore shoreline coastal Cornish cornwall England english Great Britain pool rockpool rocks rocky worn ancient circles cloud lichens neolithic plants rings sky stone wiltshire beach bright fresh red salt seawater smell summer sunny Molluscs mussels Mytilus seascape seaweed shellfish tide view waves bump bumpy coarse Dirt earth environment granite Mineral object rough Scie Soil textures