ใบงาน Moving up

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Across
  1. 1. Developing babies
  2. 3. to rot
  3. 4. Keeping something or in good conditions
  4. 9. body’s bone
  5. 11. an animal that eats other animals
  6. 12. To search informations
  7. 13. a special place where scientists dig up and find ancient fossils
  8. 14. system of buying and selling goods illegally
  9. 16. became
  10. 17. Sounds cannot travel through ______.
  11. 18. To shaking of something
Down
  1. 2. _____is used on radio waves.
  2. 3. Heinrich Hertz,______the concept of radar at the end of 19 century.
  3. 5. A group of animals that crawls or moves slowly; such as, snake, crocodile, etc.
  4. 6. Scientists discover dinosaur fossils just find ________in the dirt.
  5. 7. Sound waves travel _____solid, gas, liquid.
  6. 8. remains of old dinosaur skeletons
  7. 10. to appear
  8. 15. Sound waves can travel through any _______.
  9. 17. Their vocal chords in their throat ______, when they speak.