Question

There are two types of seismic waves: p-waves and s-waves. Which of the following describes both waves? (1 point)
Responses

Both waves occur in the ocean.
Both waves occur in the ocean.

Both waves move the ground in the direction they travel.
Both waves move the ground in the direction they travel.

Both waves move the ground perpendicular to the direction they travel.
Both waves move the ground perpendicular to the direction they travel.

Both waves cause earthquakes.

Answer 1

The best choice from the list is the one that says they both are associated with earthquakes — more accurately, both waves are produced by (generated during) earthquakes.

(Note: P‑waves are compressional — move ground parallel to travel direction; S‑waves are shear — move ground perpendicular to travel direction. P‑waves travel through solids and liquids; S‑waves only through solids.)