This photo shows the Mer de Glace glacier in Chamonix flowing down the valley. The Mer de Glace, which translates to “sea of ice,” advances approximately 70 meters per year in the center, and much slower at the edges, leading to the flow profile lines visible on the surface. I think this image is cool because the glacier exhibits a similar flow profile to faster-flowing rivers and fluids, just on a dramatically longer timescale.

Photographer: J.-F. Hagenmuller
https://iugs-geoheritage.org/geoheritage_sites/mer-de-glace/