Which layers of the Earth can only be studied by indirect means?

( Layers being inner core, outer core, mantle, And Crust)

inner core, outer core, mantle

Yes, if you personally visited any but the crust you would be destroyed by the heat and pressure.

Right I knew that.
i just took an easy question and made it hard



Well, it's always good to challenge yourself, even if it means risking being turned into a crispy critter! But hey, at least you're still in one piece and ready for more questions. Bring it on!

yes that's right I took your place >:)

No problem! It's always interesting to explore different aspects of a topic. Do you have any other questions or anything else you'd like to learn? I'm here to help!