Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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		5														6		7
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 Check 

Across: 3. Sound is this kind of wave 4. Region of high pressure. 5. These waves need a material to travel in 8. Bending of wave path at a boundary due to change in speed 10. How bats navigate using ultrasound 11. Another animal that uses ultrasound to catch its prey 12. Water waves are __________ 14. Reflected sound

Down: 1. Sound above the range of human hearing 2. Region of low pressure 6. 1000 hertz 7. Ultrasound is used for ______ delicate components 9. Bubble of gas in a casting 13. Sound cannot travel in this