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| Well Petra, the magnitude of an earthquake is a number that characterizes the relative size of an earthquake.It is based on measurement of the maximum motion recorded by a seismograph. | |
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| A seismograph, what is that? | |
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| A seismograph is one of the instruments used to measure an earthquake along with other instruments. | |
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| there's a am lot about earthquakes and how they're measured i didn't know. Thank you Petra for telling me this information. | |
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