Earth Sciences 2123F/G Lecture Notes - Lecture 16: Boothia Peninsula, Motonori Matuyama, Continental Drift
1 Dec 2016
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Document Summary
Lodestone mineral that is natural magnet ex: magnetite: early chinese compass spoon points south in 1000 ad, compass used for geomancy for a long time before it was used for navigation. North-south: died in 1603 of bubonic plague, earth behaves like a giant bar magnet with magnetic axis approximately north -south, gauss field generated inside the earth. To a first approximation geomagnetic field is like the field of a dipole (bar magnet) with geomagnetic axis titled about 11. 5 degree from the geographic axis. A magnetic need that is free to swing under the influence of a magnetic force will align itself parallel to the local magnetic field line. Not permanent bar magnetic because of high temperature destroys magnetism it exceeds. Magnetic mineral iron (fe) has a curie temperature of 770. Its more than 3000 in the outer core: inclination (i) angle measured from horizontal angle at which point into or away from earth.
