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Originally posted by Hal9000
reply to post by juggaloco
Yes there is a way to tell what is deep inside the Earth. Scientists can analyze the structure by determining how earthquake waves propagate through the mantle, as nzldude started to tell us about. To get an idea what he means the graphic from Wikipedia shows a simplified diagram.
From Wikipedia article: Structure of the Earth
I read a little about this in some FOIA documents about analyzing earthquake data in different parts of the World and how they had the capability to determine if a seismic event was natural or from some underground nuclear test. There is no direct method of telling what is under our feet, but one thing is conclusive. The core is spherical and it is certainly not hollow.
Originally posted by sherpa
That's bizarre, what process would create a cube ?
I think the general theory regarding planet formation is accretion and I had always thought of that as a sphere, even irregular shaped moons have smooth edges.
I look forward to the theories offered by the scientists to explain this