EARTHSC 1G03 Study Guide - Final Guide: Stratovolcano, Extrusive Rock, Magnetite
15 Sep 2016
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Catastrophism: catastrophes like noahds ark change the earth. Uniformitarianism: studying the present to explain the past. Paleomagnetic evidence: when magnetite freezes, it is aligned with the particles of the north pole. We know that the rocks were moving because the direction of the north pole as we dig deeper shows it changing. Magnetic reversal: arth goes through sudden shi s in polarity of north pole and south pole. Alignments of rocks are symmetric on american side of mid-ocean ridge in atlantic. Since north part of magnet points the northern magnetic pole, the northern magnetic pole actually has southern polarity. Isochron dating: how old are minerals, relative using common lines. Subduction: when a plate goes under another, brings water down with it, and the boiling water melts the rocks above it as it goes down. Magnetometer: devices that measures for stronger or weeker local magnetic field. If subduction, from shallow in trenches to deep farther into the zone.
