EESA06H3 Chapter 4: Chapter 4 Notes
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We can only look at the crust; cannot go any further. Deep parts can be studied indirectly through geophysics. Geophysics includes the study of seismic waves and earth"s magnetic field, gravity, and heat. Seismic reflection: important way of learning about the earth"s interior; 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 bending of seismic waves as they pass from one material to another. Boundaries between rock layers are usually distinct enough to be located by seismic refraction techniques. Seismic station 2 receives waves from two pathways: a direct path and a refracted path. The crust is thinner under the oceans than the continents. Seismic waves travel faster in oceanic crust than in continental crust www. notesolution. com. Mohorovicic discontinuity: the boundary that separates the crust from the mantle.
