What can scientists gain clues about by analyzing the speed at which seismic waves travel?

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

To present informationto make information easily available 

The question is incomplete. complete question is attached belowanswer: correct answer is option b  i.e.  solid particles  reason: filter paper has small pores, through which smaller particles can pass through. however, solid particles  have relatively larger size. hence, they are least likely to pass through.