How did scientists discover the different layers of earth?
I’m guessing your talking about the inner core, outer core, etc… Earthquakes produce two different waved pressure waves (P waves) and shake waves (S waves), these waves are picked up all over the world after an earth quake. When an earthquake happens there would be shadow zones where no waves where picked up or only P waves where picked up… the face that S-waves where completely blocked by the core meant that there needs to be liquid… the fact that there is P wave shadow zones proved that the core is not completely liquid and there is a inner core which is solid. The shape of these shadow zones tell us the size of the inner and outer cores and in part their densities.
