Answer:
1. vibration
2. electromagnetic
3. space
4. solid
5. slowest
6. faster
7. high
8. louder
9. ultrasound
10. infrasound
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Answers & Comments
Answer:
1. vibration
2. electromagnetic
3. space
4. solid
5. slowest
6. faster
7. high
8. louder
9. ultrasound
10. infrasound