Why is echo heard from mountains hills and big h?

1.	Why is echo heard from mountains hills and big h?
Answer» Answer: Echo is HEARD from mountains, hills, big halls because their reflecting surface is strong, rigid and SMOOTH which make the echo very effective. And due to that REASON too they can't absorb any sound. So, echo is heard from mountains, hills, big halls.

Answer»

Answer:

Echo is HEARD from mountains, hills, big halls because their reflecting surface is strong, rigid and SMOOTH which make the echo very effective. And due to that REASON too they can't absorb any sound. So, echo is heard from mountains, hills, big halls.

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Why is echo heard from mountains hills and big h?

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