Choose the correct statement about earthquake waves.
seismic waves inside earth travel only in straight lines. seismic p‑waves travel throughout the planet and s‑waves are blocked by earth's liquid core. both p‑waves and s‑waves travel at the same velocity, which does not depend on the density of material through which they are traveling. the vibrations in the p‑waves and s‑waves create gravitational waves. a richter scale is a scientific machine used to measure earthquakes.