Why do scientist use data from an earthquake to learn about earth's layers if you get the answer right i will give you brainliest!

The seismic waves are reflected (bounced off) layers of different density, and they are refracted (bent) when they enter layers of different density.

the doctrine of nullification recommended that states living inside the union have the one-sided, inalienable ideal to void any law made by the national government that could be esteemed illegal.

the united states was shaped based on a general agreement among its individual states. hence, it is inferred that under the hypothesis of invalidation, since the states are the establishment of the union, they have the ability to referee and disprove unlawful laws.