[tex]\huge\fbox\orange{A} \huge\fbox\red{N}\huge\fbox\blue{S}\huge\fbox\green{W}\huge\fbox\gray{E}\huge\fbox\purple{R}[/tex]
[tex]\huge\underline\mathtt\colorbox{cyan}{Melting}[/tex]
[tex]\huge\underline\mathtt\colorbox{red}{Sublimation}[/tex]
What a Phase Change is:
A phase change is when matter changes to from one state (solid, liquid, gas, plasma) to another. (see figure attached). These changes occur when sufficient energy is supplied to the system (or a sufficient amount is lost), and also occur when the pressure on the system is changed.
So both Melting and Sublimation are Phase Changes