Long answer short- to reproduce cells.
The reason behind S-waves' shadow being larger than P-waves' shadow zones is because S-waves cannot move through liquids or soft solids such as Earth's Core.
If you have any other questions I would be happy to answer them.
Answer:
I don't know much but try D srry I'm not good at it
Answer is in a photo. I couldn't attach it here, but I uploaded it to a file hosting. link below! Good Luck!
