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Mathematics 8 Online
OpenStudy (anonymous):

A seismograph 300km from the epicenter of an earthquake recorded a maximum amplitud of 4.2X102. find the magnitud of the earthquake

OpenStudy (anonymous):

Check this site if it helps http://mathcentral.uregina.ca/beyond/articles/earthquakes/earthquakes.html as i wish to help u but i don't know thew answer and welcome to OS

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