how we know what inside of the center of the earth if we never been there ?

Question

how we know what inside of the center of the earth if we never been there ?

In: Earth Science

Answer 1

We use the known to deduce the unknown:

i.e We can deduce the mass of the earth by observing its orbit around the sun ( 5.9 sextillion tonnes.) Then, we can observe that things on the surface of earth don’t have enough mass to fit that weight so we can deduce that the core must be more massive than the surface. An element that would fit the bill would be iron.

so on and so forth. logical deduction is the key and it can be tested.