Plate tectonics

1) Plate tectonics holds that the Earth is made up by a number of plates that move. Define the three types of plates motions. What type of plate motion occurs at the San Andreas Fault? What is the cause of the plate motion? 2) Describe how to find the epicenter of an earthquake using the concepts of P and S waves. What is the minimum number of seismic stations needed to locate the epicenter?
















































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