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Across 2. what we hear 3. pitch, lots of times per second 4. heard it twice 9. how we feel sound 12. this makes sound louder 13. makes it louder or quieter 14. you can't play games on this one 18. very very high pitch 19. a way to describe pitch 20. pitch, not many times per second

Down 1. very very low pitch 3. sound scientist 5. how we detect sound 6. how many times per second 7. underwater sound 8. measurement of sound 10. jet plane sound 11. description of sond moving 15. not a lot of sound 16. what we hear with 17. lots of sound