Questions: During various layers of Earth's structure separated into a core, a mantle, and a crust.

The statement provided seems to be an incomplete sentence or a fragment. However, it appears to be referring to the basic structure of the Earth, which is indeed divided into three main layers: the core, the mantle, and the crust. Here is a brief explanation of each layer:

1. Core: The Earth's core is divided into two parts: the inner core and the outer core. The inner core is solid and composed primarily of iron and nickel, while the outer core is liquid and also consists of iron and nickel. The movement of the liquid outer core is responsible for generating Earth's magnetic field.

2. Mantle: The mantle lies above the core and is composed of silicate rocks that are rich in iron and magnesium. It is semi-solid and can flow slowly. The mantle is responsible for the movement of tectonic plates due to convection currents within it.

3. Crust: The Earth's crust is the outermost layer and is the thinnest compared to the other layers. It is composed of a variety of rocks and minerals. The crust is divided into two types: the continental crust, which is thicker and less dense, and the oceanic crust, which is thinner and denser.

In summary, the Earth's structure is indeed separated into the core, mantle, and crust, each with distinct characteristics and compositions.