angry blue boisterous boulders coast coastline danger natural nature Pembrokeshire rocks rough sea shore spray spume wales water waves welsh canada cliff cold descend fall freezing frozen glacier ice lake landscape mountain rock Rockies Rocky Mountains slide snow Cornish cornwall England english Great Britain island islet isthmus pool rockpool view algae bladderwrack brown exposed green Lofoten Islands low tide norway norwegian orange plants seaweed weed boulder granite gray grey islands land Maddalena mediterranean pink rocky rugged Sardinia shoreline sky distance distant spit beach low ocean sand sandy summer surf tide Bolivia moon south america toruism valle de la luna valley