Read the second paragraph silently and talk about how the fog is formed.

The water discharged from Fengman Reservoir has a water temperature of about 4 degrees Celsius. The river slowly flows through the city with great heat energy, forming a lot of fog on the Songhua River, covering the trees on both sides. As the temperature drops, the fog condenses on the branches in cold weather, forming rime. Because there are water resources of Fengman Reservoir near Songhua River in Jilin Province, and the temperature is low enough to meet the two necessary conditions for the formation of rime, rime wonders can only be formed near Songhua River in Jilin Province.