Physics: What is the formal name for when a substance breaks down on heating ?

Questions

What does the Italian word paparazzi mean in the English language?

What 1954 movie pushed rock ‘n’ roll into the social mainstream and made for an entire generation of terrified parents??

Who directed the 1954 movie ‘The Blackboard Jungle’?

Which flavours of ice cream are used for Neopolitan ice cream?

How do tightrope walkers stay on the wire?