they know because of readings from seismic graphs when earthquakes occur

the behavior of the core is what one expects of molten iron or something very similar so they deduced that it is iron

Posted By: Tony Martin, Jun 30, 08:21:05

Follow Ups

^^^ see, the Wrath is better than Wikipedia...
Posted By: Ralf Scrampton, Jun 30, 09:42:22
...and Journey to the Centre of the Earth
Posted By: malkybarkid, Jun 30, 08:35:52

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