The correct answer is "core". The core is the innermost layer of the Earth, located at its center. To determine this answer, you can recall or review your knowledge about the structure of the Earth. The Earth is composed of several layers, including the crust, mantle, and core. The core is divided into two parts: the outer core and the inner core. The outer core is a liquid layer of molten iron and nickel, while the inner core is a solid sphere of iron and nickel. Therefore, the layer found at Earth's center is the core.
