# 57.14A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not

###### Question:

57.14 A sound wave traveling downward with a speed of about 4,000 m/s suddenly slows to 1,500 m/s not far below the
Earth's surface.
What has the sound wave most likely encountered?
a different kind of rock
O an underground lake
an open cavity
O a pile of dinosaur bones

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