joel

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Across
  1. 3. a space object that reflects light from the sun.
  2. 4. doesn't conduct electricity
  3. 6. helps to keep our teeth strong and is an ingredient of toothpaste.
  4. 11. exercise can make our muscle ...
  5. 14. our heart is a ...
  6. 16. birds have ...
  7. 17. a conductor of electricity
  8. 18. a young elephant
  9. 19. the largest star in our solar system.
  10. 20. a young penguin
Down
  1. 1. the lamp will shine when it is a ... circuit.
  2. 2. dark colours are ... to find in the dark.
  3. 4. the part of the teeth that usually can't be seen through X-ray.
  4. 5. a computer is easy to read because it is ...
  5. 7. light colours are ... to find in the dark.
  6. 8. do not touch damaged ...
  7. 9. the sun's position is on top of our head when it is ...
  8. 10. we should eat less ... to keep our teeth healthy.
  9. 12. if there is ... light, it is hard to see.
  10. 13. we need to keep water away from ...
  11. 15. we can help to make our teeth strong by eating food with high ...