What does a seismograph record?
a.
the Mercalli scale rating for an earthquake
b.
the speed of seismic waves
c.
the ground movements caused by seismic waves
d.
the location of the epicenter
a.
the Mercalli scale rating for an earthquake
b.
the speed of seismic waves
c.
the ground movements caused by seismic waves
d.
the location of the epicenter