What is a seismograph used for?

To count the number of buildings collapsed.

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To measure the magnitude of an earthquake.

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To alert people about an earthquake.

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To completely stop an earthquake.

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Solution

The correct option is B To measure the magnitude of an earthquake.
A device called a seismograph can be used to measure the magnitude of any earthquake. Richter scale is the unit used to measure the magnitude of these earthquakes.

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