1. Crust:
* The outermost layer.
* Thin and rigid, ranging from 3-70 km thick.
* Composed primarily of silicate minerals.
* Divided into oceanic crust (thinner, denser, and composed of basalt) and continental crust (thicker, less dense, and composed of granite).
2. Mantle:
* The thickest layer, extending to a depth of approximately 2900 km.
* Composed primarily of silicate minerals, mostly peridotite.
* The upper mantle is solid, but behaves like a viscous fluid over long timescales.
* The lower mantle is solid and more rigid.
* The mantle is responsible for plate tectonics and volcanic activity.
3. Outer Core:
* A liquid layer, approximately 2200 km thick.
* Composed primarily of iron and nickel.
* The Earth's magnetic field is generated within the outer core.
4. Inner Core:
* A solid ball with a radius of approximately 1220 km.
* Composed primarily of iron and nickel, but with a higher density than the outer core due to immense pressure.
Summary:
| Zone | Composition | Thickness (km) | State |
|---|---|---|---|
| Crust | Silicate minerals | 3-70 | Solid |
| Mantle | Peridotite | 2900 | Solid (upper), viscous fluid (upper), solid (lower) |
| Outer Core | Iron, nickel | 2200 | Liquid |
| Inner Core | Iron, nickel | 1220 | Solid |
It's important to remember that these are simplified descriptions. The Earth's interior is a complex and dynamic system with varying properties and transitions between zones.
