What's the difference between a fjord and a sound?

Related questions

1. Does Canada have fjords?
2. What is the biggest fjord in Norway?
3. Why is gas in Norway so expensive?
4. Is Puget Sound a fjord?
5. Is Drumlin a result of erosion or deposition?
6. What is the difference between a sound and a bay?
7. Are the Norwegian fjords fresh or saltwater?
8. What is a fjord and where are they located?
9. What is so special about Milford Sound?
10. What is a sound fjord?

Tags

1. #sound
2. #fjord
3. #retreats
4. #valley
5. #sinks
6. #there
7. #unlike
8. #sounds
9. #glacier
10. #valleys
11. #forms
12. #water
13. #remains
14. #fills
15. #however
16. #combination
17. #filled
18. #levels