How is the deep interior of the earth mapped

ANSWER:

The study of the seismic waves and how these are bent, reflected, sped up or delayed in the various interior layers of the earth is used to map the interior layers of the earth and get information on them.

EXPLANATION:

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;