How does a seismograph work?
A) Sensitive triggers record digital signals and change them into binary so computers can analyze the data.
B) Fluid-filled sensors register shaking signals and feed them to recorders.
C) Rotating drums are marked by pens when Earth shakes.
D) Infrared movement sensors are wired to an inverter that changes the signals to binary so computers can analyze the data.
Question 2
Due to the nature of the movement of a wave, which type of wave cannot move through gases or liquids?
A) P-waves
B) S-waves
C) body waves
D) surface waves
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