Keywords: instagram app instagramapp square square format squareformat iphoneography uploaded:by=instagram geology glacial activity glacialactivity pre-history prehistory woodlands mysticism glacial history safety conversation moss alignments soils lichens water run off waterrunoff swamps wetlands rock shelters rockshelters erosion rock climbing rockclimbing trees earthquakes outdoor A slab of glacial boulder beginning to slide and break off. It is the result of ice freezing inside of the crevice and expanding slowly, pushing off the rock sliver. This process may be accelerated up by earthquake activity. Explore Brian Ghilliotti's 341 photos on Flickr! |