What are the two applications of Echo?

Related questions

1. What causes an echo?
2. What is echo chamber effect definition?
3. Is it bad to whisper?
4. How is echo formed?
5. Is whispering talking?
6. What is the most famous echo chamber in the world?
7. What is a whisper room?
8. What is the echo effect?
9. What does an echo mean?
10. How long do results take for echocardiogram?

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2. #applications
3. #ultrasonic
4. #their
5. #science
6. #organs
7. #liver
8. #obstacles
9. #method
10. #detect
11. #uterus
12. #imaging
13. #enemy
14. #medical
15. #waves
16. #dolphins
17. #bladder
18. #human
19. #emitting