So the water expelled up through the rupture and into the atmosphere was filled with dirt fragments of various sizes. As you will see, the higher a droplet rose, the more likely it was to lose the larger particles carried inside. Therefore, the droplets that rose above the atmosphere and froze contained the powdery dirt particles that comprise yedoma hills and the world's loess. First, visualize a water droplet jetting up through the atmosphere. Atmospheric pressure drops as it goes higher, so some water evaporates from its surface.
Evaporation cools the droplet, just as evaporating perspiration cools a person.
Gusts of air and water vapor strike the droplet from differing directions, each time dragging its skin around toward the opposite, or downstream side. This creates a strong and complicated circulation within the droplet and chaotic waves on its surface. In the droplet are many tiny dirt particles. The flow within the droplet carries the smaller particles more smoothly than larger particles. In fact, the larger particles are sometimes shaken out of the buffeted droplet.