Ice, water, and snow

Once the temperature falls below 0°C there is a tension in water as it hovers between its liquid and solid forms. Still water gives up its warmth to the air and turns to ice.  The lakes freeze over. In streams and rivers the moving water churns and cools more slowly, staying liquid. As the temperature continues to fall slow moving water also cools and freezes. The water at the edge of the flow turns to ice. Once the ice starts to form it spreads out across the water, but where the current is strong the new ice crystals are swept away. If it gets colder even the surface of moving water freezes. The ice follows the contours of the flow, as in the extra with its 3D ice.
Down at the ruined mill, in winter, there are always these ever-changing patterns of snow, water and ice in the beck, as temperatures fall and rise.