Well technically speaking they don't know what it looks exactly like its just an estimate I on what it looks like I mean you could dig your entire life and not even get through the athenoshpere
We know about the inside of the Earth through seismic waves, which are waves generated by earthquakes. These waves travel through the Earth and can be detected and measured by seismographs on the surface. By analyzing how these waves behave and interact with different materials inside the Earth, scientists can infer the composition and structure of the Earth's interior.
If we do not know we can not answer.
Because they can see it.
we know whats inside the earth because there is earthquake wave
by studying artifacts found on earth
i don't know ask a scientist
beacuse.
If you look at who they are inside, and not judge by looks.
Its not like that there is no such things like that the human does not know this EVEN THE SCIENTIST does not know this
You will never know what it look like under the earth's crust :)
Scientist study earth because earth is the place that we envolved on and is the only planet in our solar system that is know to support life and is the fifth- largest planet in our universe.
they study earth crust to know about geographical history ancient whethers etc