EESA06H3 Chapter Notes - Chapter 4: Paleomagnetism, Magnetite, Gravity Anomaly
24 Apr 2016
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Earth"s crust is made of a thin skin of rock, less than 1 percent of the earth"s total volume. Mantle rocks brought through basalt flows and tectonic activities that combine oceanic lithosphere with continental crust. Meteorites also give clue about earth"s composition. However, to know fully, geoscientists study seismic waves, gravity, heat flow and earth"s magnetism. Earth is divided into three major layers. Crust and upper mantle brittle lithosphere & plastic asthenosphere. Geophysics: application of physical laws and principles to a study of the. Includes study of seismic waves and earth"s magnetic field, gravity and heat. Seismic reflection: the return of some of the energy of seismic waves to the earth"s surface after the waves bounce off a rock boundary. Seismic refraction: the second method to locate rock boundaries. The bending of seismic waves as they pass from one material to another, similar to the way that light waves bend when they pass through the lenses of eyeglasses.
