Melting of ice cream is a:-
Reversible, Physical and Temporary
Physical change:- In a physical change no new substance is formed and the chemical composition of substance remains the same. There are changes in physical properties like shape, size etc.
Temporary change:- Change that is for a limited time.
Reversible change:- Changes in which a substance can be reversed to its initial state by changing the conditions, it is said to be a reversible change.
Melting of ice cream is a physical, temporary and reversible change as melted ice cream can again be reversed to its original state by cooling and only its physical state has been changed from solid to liquid (physical change) and this change exists for the time till this melted ice cream starts to cool (temporary).