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MindlessCollar842 t1_je5as5e wrote

Reply to comment by dat_lpn_lifetho in Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger? by somethingX

It is not an easy subject to learn without foundation, and it looks like you may be confusing a few different subjects. We know quite a bit about the composition of the mantle. We can't drill to those depths, but it finds its way up (see: mantle xenoliths, ophiolites). Determining parentage and provenance of a magma body through chemistry is one of many applications of igneous petrology. If you would like references on mantle dynamics/geochemistry, please DM, I am happy to share.

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dat_lpn_lifetho t1_je635cm wrote

Its pretty cool you know so much! (Being serious). I have done most of my searching using youtube/google searchs/and wikipedia (I know it gets a lot of crap but its a decent non acedemic resource)). What I meant about its composition is that it isn't uniform, what the composition in one area may be completely different in another area. We havent even been able to get samples from the mantle yet (Apart from lava) even the Kola super deep borehole is 12,262 meters, the crust is 40 kilometers. On top of that, we know that the magnetic field and even gravity is different in different parts of the world, which would indicate that composition and density varies. Scishow on youtube just did a cool short about mantle blobs on a side note.

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