What does it mean to be recyclable? What are a few recyclable materials?

Ms.ringer asked her class "what are the favorite colors of the students in our school" which student correctly deceives ms.ringer's question

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.

Which type of seismic waves are confined at the surface