ANSWER
The process of a solid changing to a gas is called SUBLIMATION
The process of solid turning to liquid is called MELTING
EXPLANATION:
Sublimation is the transition of a substance directly from the solid phase to the gas phase without passing through the liquid phase.
This occurs when the particle of the solid acquires enough energy to completely overcome the force of attraction holding the solid particles together.
Example: dry ice in water changing directly to carbon dioxide gas
Therefore, the process of a solid changing to a gas is called SUBLIMATION
The process of solid turning to liquid is called MELTING
