Earth is composed of several layers, each with distinct properties and compositions. The outermost layer is the crust, which is relatively thin and consists of solid rock. Beneath the crust lies the mantle, a thick layer of semi-solid rock that flows slowly over geological time. The core, located at the center of the Earth, is divided into two parts: the outer core, which is liquid and composed mainly of iron and nickel, and the inner core, which is solid due to immense pressure. This layered structure plays a crucial role in geological processes such as plate tectonics, volcanic activity, and the generation of Earth's magnetic field.