* Crust: The outermost layer, ranging from 3-5 miles (5-8 km) thick under the oceans (oceanic crust) to 25 miles (40 km) thick under the continents (continental crust).
* Mantle: The thickest layer, extending from the crust to about 1800 miles (2900 km) deep. It's divided into the upper mantle (which includes the lithosphere and asthenosphere) and the lower mantle.
* Outer Core: A liquid layer of iron and nickel, about 1400 miles (2200 km) thick.
* Inner Core: A solid ball of iron and nickel, about 750 miles (1220 km) thick.
Let me know which layer you're interested in, and I can give you a more specific answer about its thickness. 😊
