inside of an ice cave with snow on the ground and rocks on top; end of a tunnel in matanuska glacier, alaska.

airborne alaska anchorage cave cavity chugach chugiak close cold cooling crystals cyclical detail durmitor eagle eisriesenwelt end erebus freeze frost glacier glenn ground ice icicles inside intrusions lava limestone low macro matanuska melt mendenhall moisture mount needle outdoor palmer park perennial permafrost ponded prince river rocks snow sound speleologist spencer stalactite stone taken temperature top traps travel tubes tunnel water william winter worthington