What is the limitation of rocks obtained from mines in studying Earth's interior?

Correct answer: They provide information only from shallow depths

Rocks obtained from mines are useful direct evidence, but mines reach only a small depth compared with the size and radius of Earth. They can tell scientists about materials near the surface, yet they cannot provide samples from the mantle, outer core, or inner core. This limited reach is the main weakness of using mine rocks to study Earth’s interior. Therefore, option A is correct.

The other choices describe impossible or unrelated claims. Mine rocks do not come directly from the inner core or serve as samples of the outer core. They also do not stop seismic waves; seismic waves travel through Earth and are studied as indirect evidence of internal layers. Since direct access is restricted to shallow regions, scientists combine such samples with seismic data, gravity measurements, and volcanic materials to infer deeper structure. Hence option A follows.