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QuizMultiple Choice

Properties of Waves

Question 1 • PBCSD_Grade_Forgiveness_2001310_Earth Space Science_S2_2019

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?

Answer
A
a different kind of rock
B
an underground lake
C
an open cavity
D
a pile of dinosaur bones
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