Which of the following sounds is produced by earthquakes before the m – McqOptions

MCQOPTIONS

1.	Which of the following sounds is produced by earthquakes before the main shock waves?
A.	low-frequency infrasound
B.	high-frequency ultrasound
C.	sounds between 200 Hz and 400 Hz
D.	None of the above
Answer» B. high-frequency ultrasound

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