Correct Option
The correct option is Differentiation.
Explanation
The Earth was initially in a volatile and molten state during its early formation. Over time, the temperature increased due to gradual density increases and heat generation. This allowed the material inside the Earth to separate according to density, a process known as differentiation.
Analysis of Options:
- Differentiation (Correct): This geological process caused heavier elements (like iron and nickel) to sink towards the center to form the Core, while lighter elements (like silica and aluminum) moved towards the surface to form the Crust. This resulted in the density-based stratification of the Earth's interior into the Crust, Mantle, and Core.
- Degassing: This refers to the release of gases from the Earth's interior, which contributed to the formation of the present-day atmosphere, not the solid interior's stratification.
- Condensation: This is a physical process related to the initial formation of stars and planets from nebular gas and dust, preceding the internal differentiation of the planet.
- Photosynthesis: This is a biological process performed by plants and certain bacteria, unrelated to the geological structure of the Earth's interior.
Key Takeaway
Differentiation is the specific process responsible for separating the Earth's materials into concentric layers (Crust, Mantle, and Core) based on their densities.