How are the crust, mantle, and core arranged inside Earth?

Earth is internally organized into three primary chemical layers, arranged by depth from the surface to the center.12

• Crust: This is the outermost, relatively thin layer. It is divided into two types: continental crust, which is thicker and less dense, and oceanic crust, which is thinner and denser.1
• Mantle: Located beneath the crust, the mantle is separated from it by the Mohorovičić discontinuity. It is the thickest layer, containing the majority of Earth's volume, and is composed of silicate minerals rich in magnesium and iron. It is further divided into the upper mantle (including the rigid lithospheric mantle and the weaker asthenosphere) and the lower mantle.12
• Core: Situated at the center of the planet, the core is composed primarily of metallic iron and nickel. It consists of a liquid outer core and a solid inner core, the latter of which remains solid due to extreme pressure despite high temperatures.12

Would you like to know more about how seismic waves help scientists identify these specific boundaries?