In the given figure below, the appropriate terms A, B and C respectively are:
A - Freezing , B - Vaporization, C - Deposition
A is freezing, B is vaporization and C is solidification.
All pure liquids have a characteristic temperature at which they convert into solids. This temperature is known as their freezing point and the phenomenon is called freezing. Freezing involves lowering down of the temperature, whereas, melting involves an increase in temperature. Pure, crystalline solids have a characteristic melting point, the temperature at which the solid undergoes melting and changes to a liquid. The melting point of a solid is the same as the freezing point of the liquid.
Vaporization is defined as the conversion of a substance from the liquid state to the gaseous (vapour) state. The reverse process, i.e., the transition from the gaseous state to liquid is known as condensation.
Sublimation is defined as the transition of a substance directly from the solid to the gaseous state without passing through the intermediate liquid state. The reverse process is known as the deposition, as gas turns directly into solid bypassing the stage of liquid.