EARTH 119 Chapter Notes - Chapter 3: Echo Sounding, Magnetometer, Magnetic Anomaly
27 Sep 2016
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Document Summary
Earth 119- chapter 3: drifting continents and spreading seas. Pangaea: a supercontinent that assembled at the end of the paleozoic era. Continental-drift hypothesis: the idea that continents have moved and are still moving slowly across the earth"s surface. Sea-floor spreading: the gradual widening of an ocean basin as new oceanic crust forms at a mid-ocean ridge axis and then moves away from the axis. Subduction: the process by which one oceanic plate bends and sinks down into the asthenosphere beneath another plate. Plate tectonics: the theory that the outer layer of the earth (the lithosphere) consists of separate plates that move with respect to one another. Magnetic dipole: an imaginary vector that points from the north magnetic pole to the south magnetic pole of a magnetic field. Magnetic poles: the ends of a magnetic dipole; all magnetic dipoles have a north pole and a south pole.
