P-wave and S-wave paths through the earth
![two 2-D cross-sections of earth with curves showing path of S waves on top and P waves on bottom](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/seismicwaves-core.png?itok=Ls5rB0OL)
Detailed Description
P-wave and S-wave paths through the earth. Scientists discovered that Earth's outer core is liquid by observing seismic waves. P waves travel through solid and liquid, but S waves do not travel through liquid.
Sources/Usage
Public Domain.