Across
- 5. vibrating lengthways
- 8. through which the wave travels
- 9. a disturbance or variation which travels through a medium
Down
- 1. a strong, thick line or cord
- 2. Back and forth
- 3. a change of position that does not entail a change of location;
- 4. It is a toy; a precompressed helical spring
- 6. it is vibrating at right angles to the spring
- 7. not rough