The sun is going down, and most of the land is dark, but we can see silhouettes and outlines of objects because some light is still the atmosphere.

The Sun is going down, and most of the land is dark, but we can see silhouettes and outlines of objects because some light is still scattered the atmosphere. When sunlight reaches Earth's atmosphere it is scattered in all directions by all the gases and particles in the air.Blue is scattered more than other colors because it travels as shorter, smaller waves and is scattered in all directions.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.