Seismographs
are scientific instruments used to measure earthquakes. The answer is letter A.
Its goal is to detect any slight movement caused by the earth’s crust. It is
measured in seismic waves (the waves that the earthquakes’ produce). These waves
are recorded in a white paper caused by the weight of the pen. It is called as
seismogram. The seismograph can also tell how far and how strong the earthquake
was. An oscilloscope is a device used to measure waves produces by a sound. A radar
is a system used to detect the distance, direction
