Iwill make you the brainliest scientists are able to learn about earth's interior by studying s and p waves. describe how these waves offer insights into the earth's layers.

It's called refractive/reflective seismology. S waves will not travel through liquid though P waves will. So if we look at a seismograph that shows at a point S waves stop but P waves continue on we know that there is a liquid there. Further, we can use Snell's law to define geologic interfaces beneath the surface by looking to see how and where these seismic waves refract or reflect.

None   they are   equally likely to occur on any plate boundary