Breathe in. Breathe out. Ready? Try to answers these questions about the air and find the answers in the word find.

　　1. Everyday a person needs 550 liters of ___________.

　　2. It took 1.5 _______ years to make enough oxygen for humans to breathe.

　　3. If there is not enough oxygen in the air, you will feel very __________.

　　4. This planet’s air is mostly carbon dioxide.

　　5. When you ________ you breathe less often.

　　6. When you ________ you breathe more.

　　7. Relax. Take a deep ___________.

　　8. A person breathes in and out 15 to 20 times a ________.

　　9. Don’t light that match! Oxygen can _______ very easily.

　　10. The United States agency that sends astronauts into space.

　　S E F T U Z E B H O R I

　　L P T P B W H N P R I B

　　E K I U L Z N T I Z Z L

　　E X R L N B G P P A S D

　　P N E Y E I T P G V Q Z

　　G A D R P L M I G R O O

　　P S T F C L A H F I X X

　　A A E O I I R T W Y M E

　　A H Y V Z O S A G Y V X

　　U L Q X X N F E I Y P U

　　S S U E C K N R O O C E

　　H J V R Y J J B U M C H

　　Answers:

　　1. oxygen

　　2. billion

　　3. tired

　　4. Mars

　　5. sleep

　　6. exercise

　　7. breath

　　8. minute

　　9. burn

　　10. NASA

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　　S + E B + I X + + + + +

　　R + + R R L + Y + + + +

　　A + + E C L + + G + + +

　　M + D A M I N U T E + +

　　+ + + T + B S A S A N +

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