Talk:inner core

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Tagged by Logomaniac, not listed. - -sche (discuss) 06:13, 30 September 2012 (UTC)

I'm striking and detagging this as clearly attested. Logomaniac may have thought it was SOP... - -sche (discuss) 00:43, 1 October 2012 (UTC)


RFD discussion[edit]

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SOP? Even the two-word translations link the individual words. (Ages ago, this was tagged {{rfv}} by Logomaniac, who tagged several other entries with rfv-tags but rfd-rationales. Hence I changed the tag to {{rfd}}.) - -sche (discuss) 00:46, 1 October 2012 (UTC)

Keep. Inner core doesn't simply mean "the innermost part of the Earth." It's a geological term that refers to a specific part of the Earth's internal structure. The inner core is structurally different than the outer core. The inner core is a solid ball believed to consist of an iron-nickel alloy; the outer core is a liquid layer of the same elemental composition. That difference is crucial to understanding things like how the Earth's magnetic field works. Astral (talk) 02:26, 1 October 2012 (UTC)
Then, I guess, we will need outer core as well. --Hekaheka (talk) 05:25, 1 October 2012 (UTC)
But does "inner core" mean all that, or is it just that "inner core" means "[[inner]] [[core]]" and it happens that earth's inner core has those specific properties? The existence of google books:"Jupiter's inner core", google books:"Jupiter's inner core", google books:"Mars' inner core", google books:"moon's inner core" suggests the latter. The specific composition of earth's inner core is then a matter for an encyclopedia, whereas "Earth's inner core" and "inner core" are SOP in a dictionary. - -sche (discuss) 05:39, 1 October 2012 (UTC)
It seems like the general definition that all of the above are using is "Part of the planet at such high pressure that it is solid despite its high temperature". If "inner core" just means "innermost part of the planet", the phrase "no inner core" would be meaningless (unless your planet is shaped like a jam doughnut), but it's perfectly attestable:
  • Venus is also significantly different in that it has no magnetic field. It certainly differentiated an iron core, but if the pressure is too low and the temperature too high no inner core will form, thus eliminating a possible source for a geodynamo.
  • Core cooling [on Mars] decreased to the point where conductive heat loss dominated (but no inner core formed).
  • The members of the subset J in Table 5.2 range from the extreme (top) member, which has no inner core (no free Fe) and for which p=pc at the MCB, to the other extreme (bottom) member which has no outer core (no Fe2O) and for which p=pc at the mantle-inner core boundary.
The last one suggests an equivalent definition of outer core "Part of the planet hot enough to be predominantly liquid", and that it's possible to have an inner core but no outer core, or an outer core with no inner core. In other words, inner core is not just "inner" + "core". Smurrayinchester (talk) 08:00, 1 October 2012 (UTC)
Keep per Smurray's arguments and data. DCDuring TALK 13:53, 1 October 2012 (UTC)
I've changed my opinion to keep per Smurray. - -sche (discuss) 18:58, 1 October 2012 (UTC)
Keep. Mglovesfun (talk) 09:49, 2 October 2012 (UTC)

Kept. bd2412 T 03:05, 2 January 2013 (UTC)