New weather in the north

(1) There is a layer of snow on the roof. During the day, under the irradiation of the sun, part of the snow absorbs the heat of the sun, and changes from solid ice to liquid water flowing down the eaves, which belongs to the melting process. Because of the cold weather, water releases heat in the process of flowing down, changing from liquid water to solid ice, forming an ice valve, which belongs to the solidification process.

(2) Scheme for pedestrians to pass safely under similar circumstances: ① Keep a certain distance from the building when passing; (2) Remove the ice valve; ③ Observe whether the ice valve may drop at any time. (Reasonable is enough)

So, the answer is: endothermic; Melting; Curing; Exothermic; Keep a certain distance from the building when passing.