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 cause earthquakes.
Both waves cause earthquakes.

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.

Answer 1

Best choice: "Both waves cause earthquakes."

Clarification: More precisely, both P-waves and S-waves are produced by earthquakes (they are seismic waves generated when an earthquake releases energy). P-waves are compressional (move ground in the direction of travel) and S-waves are shear (move ground perpendicular to the travel direction); S-waves cannot travel through liquids (so they don't travel through the ocean).