What best describes the difference between a seismograph and a seismogram
a. a seismograph records tectonics activity, while a seismogram records volcano activity
b. a seismograph is the instrument that detects and records movement which in earth, while a seismogram is the recording
c. a seismograph is the instrument that detects and records volcano activity, while seismogram is the written records of that activity
d. a seismograph is a written record of volcano eruption, while seismogram is a written record of an earthquake