Cinematic 4K. High cliff deep cliffs mountains valley erosion precipitation crash breakage wear limestone rock rocks space gulf precipice abysm depth abyss deepness perspective profoundness gap cavity clearance void elevation bird nest security hazard attention mountaineering climb wall danger stones green yellow brown sumptuous natural nature steep aerial sky flying fly geologic timescales geological formation time documentary geography canyon tectonic uplift between carved landscape erosive activity surface layer region resistant peak summit material best karst topography