Question

the sound generated by vibrations of the earth's crust just before an earthquake is ... wave

options:
a) supersonic wave
b) ultrasonic wave
c)infrasonic wave
d) audible wave
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Answer 1

Answer:

Seismic Wave

Explanation:

As discussed in Lesson 5, earthquakes occur when elastic energy is accumulated slowly within the Earth's crust as a result of plate motions and then released suddenly at fractures in the crust called faults. The released energy travels in the form of waves called seismic waves.

Answer 2

no c infrasonic wave

Explanation:

this also happens when a volcano erupts