Question

what is crust ,core,mantle​

Answer 1

The internal structure of the Earth is layered in spherical shells: an outer silicate solid crust, a highly viscous asthenosphere and mantle, a liquid outer core that is much less viscous than the mantle, and a solid inner core.

Answer 2

they are the different layers of earth crust is the outermost layer core is second layer and mentle is the innermost layer of earth