Eli5: How do know about the Earths layers if we’ve barely scratched the surface ?

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Given it’s roughly 4,000 miles to the center of the corner, and according to resources, we’ve (humans) have only gotten about 18 miles deep. So how is it possible we know what’s beneath us?

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Anonymous 0 Comments

Most things we still dont know, we just have a rough idea about the density and what it is prooobably made of. But we know very little about it. Even things we may have learned in school about this topic, a lot can be just wrong. Science still doesnt know everything and we can sometimes just guess when we dont have a lot of data.
Wouldnt be the first time we had a lot of mistakes in our books. We still have those mistakes, that is sure!

There are many surprises all the time which no scientist couldnt even think of which can lead to wrong conclusions.
We are very early here. We just have a rough idea about the earths core and lots of theories and ideas can be wrong.

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