The correct answer is D. Seismograph.
A seismograph is an instrument that measures and records ground motion. It is used to detect earthquakes, volcanic eruptions, and other seismic activity. The seismograph was invented in 1880 by John Milne, an English seismologist.
The seismograph consists of a mass that is suspended from a frame. The mass is attached to a pen that records the ground motion on a paper chart. When the ground shakes, the mass moves relative to the frame. This movement is recorded by the pen on the chart.
The seismograph can be used to measure the magnitude and intensity of an earthquake. The magnitude of an earthquake is a measure of the energy released by the earthquake. The intensity of an earthquake is a measure of the shaking that is felt at a particular location.
The seismograph is an important tool for seismologists. It is used to study earthquakes and to predict future earthquakes.
The other options are incorrect.
- Ediograph is an instrument that is used to record the movements of the body.
- Pantagraph is an instrument that is used to copy maps and other documents.
- Ergograph is an instrument that is used to measure the amount of work that a person does.