Across
- 3. Sound is produced when objects do this
- 4. What sound requires to travel
- 7. a space which has no matter in it
- 8. small waves that formed when we throw pebble into the river
- 9. this happens when we move closer to the source of the sound
Down
- 1. the object which produces the sound
- 2. one of the mediums for sound to travel
- 5. this happens when we travel farther from the source of the sound
- 6. the medium requires for sound to travel in tin can telephone