Discussion
Earthquakes are measured by a
Answer: B
Earthquakes are measured by a seismograph.
A seismograph (seismometer) detects and records the ground waves an earthquake produces; the record is a seismogram, from which the magnitude (for example on the Richter or moment magnitude scale) and the epicentre are worked out.
A mammograph is a medical X-ray machine for breast imaging. A speedometer shows a vehicle's speed, and an anemometer measures wind speed.
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