useless trivia: What Word Means: Burns The Surface?

Questions

Who not only sang the hit song the Power Of Love for the movie Back To The Future, but also appeared in it?

Who plays a nearsighted neighbour in the two Ghostbusters movies?

Who was Fred Astaire's partner?

What kind of clay can potters heat to a higher temperature earthenware or stoneware?

What metal makes up most of earth's centre copper, gold or iron?