Here's a breakdown:
Chemical Composition:
* Crust: This is the outermost layer and is composed primarily of lighter elements like oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium. It's further divided into the oceanic crust (basalt-rich) and the continental crust (granite-rich).
* Mantle: This layer is largely composed of silicate minerals rich in iron and magnesium. It makes up about 84% of Earth's volume.
* Core: The core is primarily composed of iron and nickel, with smaller amounts of sulfur, silicon, and oxygen. It's further divided into the solid inner core and the liquid outer core.
Physical Properties:
* Lithosphere: This is the rigid, outermost layer of Earth, consisting of the crust and the uppermost part of the mantle. It's broken into tectonic plates.
* Asthenosphere: This is a partially molten layer in the upper mantle, characterized by its plasticity and ability to flow slowly over geological timescales.
* Mesosphere: This is the lower part of the mantle, which is solid and very hot.
* Outer core: This is a liquid layer of iron and nickel. It's responsible for generating Earth's magnetic field.
* Inner core: This is a solid layer of iron and nickel, despite the extreme heat and pressure.
The classification by chemical composition and physical properties helps scientists understand the Earth's structure, its evolution, and its dynamics.
