Explanation:

Only statements 1&3 are correct.

• All natural earthquakes take place in the lithosphere.

• Earthquake waves are basically of two types — body waves and surface waves. Body waves are generated due to the release of energy at the focus and move in all directions traveling through the body of the earth. The body waves interact with the surface rocks and generate new sets of waves called surface waves. These waves move along the surface. The velocity of waves changes as

• They travel through materials with different densities. The denser the material, the higher is the velocity.

• The surface waves are the last to report on seismographs. These waves are more destructive. They cause displacement of rocks, and hence, the collapse of structures occurs.

Hence option 3rd is correct.