cliff crag current dangerous drop fall fierce flow forest green mountain natural nature norway norwegian powerful rock strong violent water waterfall America aquamarine blue boulder cascade clean clear cold fast pool pure refresh river transparent coast face fleshy fractured Great Britain leaf leaves navelwort plant Umbilicus rupestris united kingdom wales welsh bay beach coastline Cornish cornwall cove England english rocky sand sea shore surf waves canada conifer descend hillside plunge pour Rockies Rocky Mountains Tangle Falls tree waterfalls altitude austere broken hard height high landscape montane shattered stark summit top algae bare bivalve exposed kent mollusc mussel Mytilus edulis rockpool seaweed shellfish stone Dirt earth environment igneous metamorphic Mineral object science Sed Soil