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How do scientists known what the center of the earth is?
>The distance to the center of the Earth is 6,371 kilometers (3,958 mi), the crust is 35 kilometers (21 mi) thick, the mantle is 2855km (1774 mi) thick — and get this: the deepest we have ever drilled is the Kola Superdeep Borehole, which is just 12km deep. In truth, we have almost no direct knowledge of anything beneath the crust
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>>8587157
S-waves
P-waves
earthquakes
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>>8587157
https://en.wikipedia.org/wiki/Seismic_wave#Notation
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Geology student here. I had it explained to me by a professor this way:
There's what we tell the public
There's what we tell undergraduates
There's what we tell graduates
There's what professors learn
There's what researchers try to figure out
There is the truth
Guess where you are? There's a lot that's being obscured from you because it gets complicated but saying we know what the center of the Earth is is a lie. We have some ideas but anything below the crust is estimates, anything below the moho is guesswork
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>>8587169
pretty much this. Guesses based on what we think happens to terra firma when placed under extreme pressure and heat. The idea that we know the center is 'Solid Nickel/Iron' is absurd, it's a theory that is contested and there is no consensus. Pwaves do not pass through the center, but now they are saying they do, much conflicting data.
http://www.livescience.com/6980-finally-solid-earth-core.html
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>>8587157
it just a theory
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