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andreev551 [17]
3 years ago
7

What causes an echo?

Chemistry
2 answers:
Ira Lisetskai [31]3 years ago
8 0
Answer:
Reflection

Reason:

Reflection is like looking at yourself through a mirror, so it would be the same for sound. And sound waves are REFLECTED back
spayn [35]3 years ago
7 0
The answer is reflection
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