High up in the mountains you can find the ice glaciers, and although they are very cold, microorganisms can live even there. Microorganisms prefer to live around dirt-particles, because they love to eat dirt.
The white snow and the glacier-ice throw back the warming sunlight but in the area where the dirt-particles are on the surface, the sunlight stays.
As a result, it gets warmer and the dirt melts a hole in the ice and the melted water forms a small lake. In this tiny lake (cryoconite) live bacteria, fungi, other microorganisms and tardigrades. You can see them in the microscope.