Final answer:
The crust, mantle, and core are Earth's three major concentric zones. The mantle is a semi-solid layer that behaves plastically, while the core, made of iron and nickel, has a solid inner part and a liquid outer part.
Step-by-step explanation:
Earth's three major concentric zones are the crust, mantle, and the core. The core can be further separated into the inner and outer core, with the inner core being solid and the outer core being liquid, both primarily composed of iron and nickel.
The mantle surrounds the core and is composed of a solid that can behave in a plastic manner, being less dense than the core.
The crust is the thin outer layer, varying in thickness and composition, with continental crust being thicker and less dense compared to the oceanic crust.Earthquakes and computer modeling provide scientists with information to understand these layers.