Description of a seismograph to measure/detect seismic waves

Seismologists utilize two fundamental gadgets to gauge a tremor: a seismograph and a seismoscope. The seismograph is an instrument that measures seismic waves created by a quake. The seismograph has three primary gadgets, the Richter Magnitude Scale, the Modified Mercalli Intensity Scale, and the Moment-Magnitude Scale.

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The answer is c) tons

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