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