Question 1
The earliest seismographs were designed by the Chinese nearly 2000 years ago to measure ________. One of these featured gold balls that dropped into the mouths of statues of gold frogs.
◦ the direction to the earthquake focus
◦ the magnitude of an earthquake
◦ the intensity of an earthquake
◦ the depth of an earthquake focus
Question 2
Modern seismographs rely on ________ to record the ground motion from an earthquake.
◦ buoyancy
◦ density
◦ mass
◦ inertia