Which best describes the difference between a seismograph and seismogram?



 
A.
A seismograph is the written record of earthquake activity, while a seismogram is the instrument that detects earthquakes.


 
B.
A seismograph detects earthquake activity, while a seismogram measures the depths of the earth's layers.


 
C.
A seismograph detects earthquake activity, while a seismogram is the written record of that activity.


 
D.
A seismograph detects continental drift, while a seismogram detects plate tectonic movements.