Revolving core

• Autores: Aidan Karley
• Localización: New scientist, ISSN 0262-4079, Nº. 3090, 2016, pág. 57
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • A question and answer advisory regarding the Earth's north and south magnetic poles "flip" is presented. Among other things, people know of an underground volcanic intrusion that cooled over thousands of years in which different parts of the structure have preserved distinctly different magnetic orientations. This has been interpreted as meaning that the duration of a reversal event is indeed on the timescale of millennia. This is in general agreement with their (admittedly inexact) theoretical models of these events, and is why geologists do not give much credence to "polar-reversal-doom" scenarios. Over an animal's lifetime, the changing of fields is unlikely to override other cues that help it navigate, such as prior experience