Answer:
Inform students about the plotted earthquakes. As you have noticed, the dots you added fall along, or near, the lines you drew. These lines represent plate boundaries . At these plate boundaries are faults, which are cracks in the earth's crust where movement has taken place.
Triangulation can be used to locate an earthquake. The seismometers are shown as green dots. The calculated distance from each seismometer to the earthquake is shown as a circle. The location where all the circles intersect is the location of the earthquake epicenter.
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