The correct option is 10-200 km.
Explanation
The Earth's interior is structured into layers based on mechanical properties. The Lithosphere is the rigid, outermost shell of the Earth, distinct from the underlying semi-plastic Asthenosphere.
Detailed Analysis:
- The Lithosphere consists of the crust (both continental and oceanic) and the uppermost solid mantle.
- Its thickness is not uniform across the globe:
- Oceanic Lithosphere: It is relatively thin, ranging from very few kilometers at mid-ocean ridges to approximately 100 km in older ocean basins.
- Continental Lithosphere: It is significantly thicker, extending up to 200 km beneath stable continental cratons.
- Consequently, the standard estimated range for the thickness of the lithosphere is 10 to 200 km.
Incorrect Options Analysis:
- 5-10 km (5-10 km): This range corresponds to the thickness of the Oceanic Crust alone, not the entire lithosphere.
- 200-400 km (200-400 km): This depth corresponds to the Asthenosphere, the weak, viscous layer of the upper mantle on which the lithosphere floats.
- 2900-6378 km (2900-6378 km): This range corresponds to the Earth's Core (Outer and Inner Core).
Key Takeaway: The Lithosphere is the solid, rigid outer layer of the Earth comprising the crust and the uppermost mantle, with a variable thickness of 10-200 km.