We learned that sound travels in waves. Just like a ball, sound waves can bounce off smooth objects. If sound waves bounce back, then you hear them twice. This is called an echo.
Here's a guy in the mountains:
Here are some people in a tunnel.
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Thanks for visiting Mr. W Reads. Feel free to leave a comment or question, and I will respond as quickly as possible. All comments are moderated, so your comment may not appear right away.