We have the technology to not only see magma, but also to take samples of it, samples which are studied for geological and other reasons. However, samples of magma are not always representative of how magma might look in the earth because the samples are generally magma that has cooled quickly.
Is that how we use geothermal energy?
We definitely do NOT have samples from the earth’s core. The knowledge that the outer core is liquid comes from seismic studies. At best, some inclusions in volcanic rocks may have mantle sources, which is far shallower than the earth’s core.
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