5. you are exploring in a cave and call out to one of your friends. you hear your echo. which interaction of sound, (reflection, refraction or absorption), caused the echo and how did the sound waves move? (5pts)

the answer is c.

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the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.