The correct option is 1 and 3 only.
Explanation
The interior of the Earth is classified mechanically into the lithosphere, asthenosphere, mesosphere, and core. The lithosphere represents the rigid, outermost shell of the planet, distinct from the chemically defined layers of crust and mantle.
Statement 1 is Correct: The lithosphere refers to the portion of depth extending up to 200 km from the surface of the Earth. Its thickness varies significantly, being thinner under the oceans and thicker under the continents, but the 200 km limit is the standard definition used in physical geography.
Statement 2 is Incorrect: The lithosphere is not limited to the crust. It is a composite layer that includes the crust and the uppermost solid part of the mantle. It floats on top of the asthenosphere, which is the highly viscous, mechanically weak, and ductile region of the upper mantle.
Statement 3 is Correct: The lithosphere is the layer where all natural earthquakes take place. Earthquakes require a brittle material that can accumulate stress and fracture (faulting). The lithosphere possesses this property, whereas the underlying asthenosphere is ductile and flows under stress rather than breaking.
Key Takeaway: The Lithosphere is the rigid outer layer of the Earth comprising the crust and the uppermost solid mantle (up to 200 km), serving as the zone for seismic activity.