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your answer is in bold. i put some other useful knowledge about earthquakes in there for you.

a seismograph. these are especially used when there are earthquakes. an earthquake happens when the tectonic plates slip past each other, like the san Andreas fault in California, which is called a transform boundary. they can collide right into each other which would make one go under the other. the oceanic plate is more dense so it will go under the continental plate. this is called a subduction zone. also it is where mountains are created. like the himalayans in India. anyway, earthquakes shake the earth, which send waves through it. seismographs are used to figure out the distance to the epicenter of the earthquake, where it really occured. there are two types of waves that i have learned about, p-waves, which always come first, and s-waves.

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