1. Crust:
* Thickness: 5-70 km (3-44 miles)
* Description: The Earth's outermost, solid, and thinnest layer. It's composed mainly of igneous, sedimentary, and metamorphic rocks. The crust is divided into oceanic crust (thinner, denser, and younger) and continental crust (thicker, less dense, and older).
2. Mantle:
* Thickness: 2,890 km (1,796 miles)
* Description: The thickest layer of the Earth, composed primarily of silicate minerals rich in iron and magnesium. The mantle is mostly solid but behaves like a very viscous fluid over long periods due to intense heat. It's further divided into the upper mantle and the lower mantle.
3. Outer Core:
* Thickness: 2,200 km (1,367 miles)
* Description: A liquid layer primarily composed of iron and nickel, with smaller amounts of sulfur, silicon, and oxygen. The outer core's movement generates the Earth's magnetic field.
4. Inner Core:
* Thickness: 1,220 km (758 miles)
* Description: A solid sphere primarily made of iron and nickel, with temperatures reaching over 5,200°C (9,392°F). The intense pressure, even though the inner core is solid, is so great that it prevents the iron from solidifying in the same way as the crust.
Note: The thickness of the Earth's layers can vary slightly depending on the location and method of measurement.
