1. Crust: The outermost layer of the Earth, composed of relatively light and brittle rock. It's divided into oceanic crust (thinner and denser) and continental crust (thicker and less dense).
2. Mantle: The thickest layer, extending from the crust to the outer core. It's mostly solid but behaves like a very viscous fluid over long periods, allowing for the movement of tectonic plates.
3. Outer Core: A liquid layer composed primarily of iron and nickel, responsible for generating Earth's magnetic field.
4. Inner Core: A solid sphere of iron and nickel at the Earth's center, with extremely high temperatures and pressures.
It's important to note that these are just the main divisions. Within each of these sections, there are further sub-layers and variations in composition and properties.
