Question

Geologists obtain indirect evidence about Earth’s interior by
a.
measuring pressure differences at Earth’s surface.
b.
estimating temperature inside earth.
c.
directly looking under the many layers.
d.
recording and studying seismic waves.

Answer 1

${\huge {\mathfrak {Answer :-}}}$

➡️ $<b>d. recording and studying seismic waves </b>(seismology)$.

That's it..

Answer 2

recording and studying seismic waves..