Answer:
melt
Step-by-step explanation:
if you heat an ice it will melt
if you heat an iron it will melt
if you heat plastic it will melt
almost everything will melt if you heat it except for wood, paper, and leaves
it will not become solid if we heat it but it will if you cool it.
but some items will rise if you heat it like cake mix and etc.
for sure it will not cool down if heat it so the answer should be melt.