What is the difference between a seismograph and seismogram? a) a seismograph is an instrument that records movements within the earth. a seismogram is an instrument that monitors the earth's core.' b) a seismograph is an instrument that records movements within the earth. a seismogram is the actual recording that scientists look at when studying earthquakes. c) a seismograph is an instrument that monitors the earth's core. a seismogram is an instrument that records movements within the earth. d) a seismograph is the actual recording that scientists look at when studying earthquakes. a seismogram is an instrument that records movements within the earth. q 2) which word describes the nature of the inner core of the earth? a) plastic b) solid c) liquid d) gaseous