This article focus to Discuss on the Earth’s Structure. Our Earth can be divided directly into four concentric zones. The innermost is referred to as the inner core and is considered a solid, spherical mass of iron. Its radius is all about 1, 216 kilometers. Another zone, called the external core, is believed becoming a layer of molten liquid abundant in nickel and iron that’s about 2, 270 kilometers thick. The outer core is overlain from the mantle, which is a great yet puttylike rock which could actually flow.