You may have heard of the sliding rocks or moving rocks found in Racetrack Playa in Death Valley, California. The mystery was about how the rocks could move and create gouges into the dry mud. One theory is that ice forms on the ground’s surface when it gets cold at night and the wind pushes the rocks along.
Same thing is seen here in this image of these two rocks on a frozen lake called Saganasghee Slough in Illinois. It is especially noticeable in the rock on the right with the trail gouged into the lake’s surface behind it. Most likely, the slight incline of the ground, along with the lake freezing and harsh winds created a similar result as in the one in Death Valley.
Temperature at time of photo: 10°F / -12°C
Sagansghee Slough – Illinois (USA)