What are the causes of echo?

Related questions

1. What is an example of reverberation?
2. What does an echocardiogram show that an ECG does not?
3. Whats the difference between echo and delay?
4. What is reverb time?
5. What will an echocardiogram reveal?
6. What does a normal echocardiogram mean?
7. What does delay do to vocals?
8. Why do we hear echo?
9. What exactly is reverb?
10. Can an echocardiogram detect clogged arteries?

Tags

1. #according
2. #waves
3. #moderately
4. #surface
5. #building
6. #light
7. #turned
8. #their
9. #causes
10. #caused
11. #course
12. #meeting
13. #reflection
14. #sound