State the use of a seismometer. What magnitude of an earthquake is considered very severe? Name the scale on which the magnitude of an earthquake is measured.
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Explanation:
A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not.
Richter scale is the scale on which the magnitude of an earthquake is required
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