1. Crust: The outermost layer of the geosphere, the crust is relatively thin and composed of mostly igneous, sedimentary, and metamorphic rocks. It's divided into two types:
* Oceanic crust: Thinner and denser, primarily composed of basalt.
* Continental crust: Thicker and less dense, mainly composed of granite.
2. Mantle: The thickest layer of the Earth, the mantle is primarily made up of solid rock, but it behaves like a very viscous fluid over long periods due to high temperatures and pressure. It's further divided into:
* Upper mantle: Contains the asthenosphere, a soft, partially molten layer that allows tectonic plates to move.
* Lower mantle: More solid and denser than the upper mantle.
3. Outer core: A liquid layer composed mostly of iron and nickel. The movement of the outer core generates Earth's magnetic field.
4. Inner core: A solid sphere, also composed of iron and nickel, with incredibly high temperatures and pressure.
Additionally:
* Lithosphere: This rigid layer includes the crust and the uppermost part of the mantle. It's broken into tectonic plates that move and interact, causing earthquakes, volcanic eruptions, and mountain formation.
These layers are constantly interacting and changing over geological time scales, influencing processes like plate tectonics, volcanic activity, and the formation of mountains and oceans.
