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What causes an echo?

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Sounds waves bouncing off objects... I think.

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Absolutely correct. The delay is caused by the amount of time necessary for sound waves to travel.
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when sound waves bounce of multiple objects then back at you

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Ok I know this. I learned it in 3rd grade. Its whenever sound waves bounce of an object and then come back to the original point it left. For example, bats use sonar which uses the echo to its advantage. It makes a noise that bounces off of something. If it comes back loud, it's food, if it's quite, it's a rock or something in it's way. It's so high pitched that only the bat can hear it, though.

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the voices we make bounce off walls and creates sound waves then you hear an ECHO,echo

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Sound waves bouncing off an object, which returns to you in the form of your voice (and sound waves).

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it would be the reverberation of sound bouncing off objects in an empty to almost empty space.

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sound bouncing around and it only happens in certain structures

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sound waves bouncing off particular walls.

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When sound bounces back from any surface

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The sound waves bounce off objects and back to you.

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The sound waves bounce off the objects. :) It's cool.

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sound bounces off walls

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Echo mainly happens in mountain ranges... When you shout, your voice breaks into many small as it reaches the mountains and that is how you get too many voices when you shout !!! Cool, ain't it ??

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Vibration and frequency

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when sound waves bounce off of objects,walls,ect...

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the bounce of the voice makes an echo

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This may help you research a little further: Light waves are sine waves. Sound waves are compressional waves. If you shout and hear an "echo" it means that the wave is being reflected back to your ears (or a listening device) by an object. As I recall, in order for you to recognize the reflected sound as a "echo," the minimum distance the reflecting object must be from the sound of your voice is 55 feet in .

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mrdrcooldude

sound waves bouncin off of walls and stuff

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