1. Crust:
* Continental Crust: 30-70 km (19-43 miles) thick.
* Oceanic Crust: 5-10 km (3-6 miles) thick.
2. Mantle:
* Upper Mantle: ~660 km (410 miles) thick.
* Lower Mantle: ~2,200 km (1,367 miles) thick.
3. Outer Core:
* ~2,200 km (1,367 miles) thick.
4. Inner Core:
* ~1,220 km (758 miles) thick.
Important Notes:
* Variations: These thicknesses can vary slightly depending on location and factors like tectonic plate activity.
* Composition: Each layer has a distinct composition:
* Crust: Primarily made of igneous, metamorphic, and sedimentary rocks.
* Mantle: Mostly composed of silicate minerals like olivine and pyroxene.
* Core: Largely composed of iron and nickel, with traces of other elements like sulfur.
* State of Matter:
* Crust and Mantle: Solid but can behave like a very viscous fluid over geological time scales.
* Outer Core: Liquid, due to the extreme heat.
* Inner Core: Solid, even though it is extremely hot, due to the immense pressure.
