History, 30.04.2021 01:00 crowdedallys5385

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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?
O a different kind of rock
an underground lake
an open cavity
a pile of dinosaur bones

Answers: 1

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A sound wave traveling downwar...