Ice and snow, aren't just prominent in weather and feared in avalanches. In the long term, cumulative snow layers compressed into ice masses form glaciers. These glaciers actually move up to hundreds of meters a year, thanks to water pockets in the lower layer, which frictions on rocky surfaces, polishing even the hardest mountains. In geologic time frames, ice age phases embody dramatical climate change -with colossal consequences for all life- and reshape the face of the earth, over and over, relatively fast.
—KGF Vissers