algae bare beach boulders chalk cliff coast destroyed destruction England erode erosion Great Britain kent landscape low natural nature nodules Remains remnants rock sea seaweed shore stones tide uncovered white worn Angus Arbroath cliffs coastline danger disused drop edge fall grass horizon quarries quarry scotland seashore shadow splash steep stone strong sundland water ancient architecture battlements boulder castle Cornish cornwall dominion english fortress historical Michael mount national trust old power quality saint St. Michael's Mount stronghold supremacy tower turret windows altitude austere avens broken canada Dryas endurance endure extreme flower hard hardy height high montane mountain plant resilient Rockies Rocky Mountains seedhead shattered splintered stark summit top tough aquarium aquatic arm barnacle biology coastal conservation creature environment environmental fish life marine ocean planet pool purple rockpool save seastar shell starfish tidepool away barren bleak blue brown clouds copyspace distance distant empty far heather highland hill hills moor moorland mountains peat quiet remote road rocky rugged rural scottish sky