I'll give you Branilest! Which layers are solid? (more than one answer is possible)

A. Inner Core

B. Mantle

C. Outer Core

D. Crust

A. Inner Core

Explanation: The inner core is solid, the outer core is liquid, and the mantle is solid/ plastic. This is due to the relative melting points of the different layers (nickel - iron core, silicate crust and mantle) and the increase in temperature and pressure as depth increases. Hope this helps :) If not, I am sorry :( If it does, Your Welcome!