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Post by skyship on Jun 21, 2016 2:18:19 GMT -5
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Post by taracellington on Oct 17, 2016 0:04:04 GMT -5
idea of Earth consisting of a hollow shell about 800 km thick, two inner concentric shells and an innermost core, about the diameters of the planets Venus, Mars, and Mercury. Atmospheres separate these shells, and each shell has its own magnetic poles.You can get more about this topic from cheap essay,one of the best online resource available now.
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