background Cornish cornwall cracked England english geology gray Great Britain grey lines natural nature rock sedimentary texture worn yellow autumn bridleway fall footpath forest green leaves path sunlight Sussex track trail trees woodland Balearic Islands eroded erosion formations limestone Lluc majorca Mallorca pleated shapes Spain striated striation buttercups field flowers grasses landscape Lofoten Islands meadow mountains norway norwegian plants ranunculus summer wild Umbelliferae umbellifers verge wayside white beach coastline ocean sand sea shore surf surfing tide water waves algae cliff coast marine Pembrokeshire rockpools rocks seaweed united kingdom wales welsh