Across
- 6. An Italian scientist who improved the telescope
- 7. The upward force that helps planes fly
- 9. A gas your body needs to stay alive
- 10. When light bounces off a surface
- 12. The line separating Northern Ireland and the Republic
- 15. How air moves around objects like planes
- 18. The muscle that helps your lungs breathe
- 19. The forwards force that moves planes ahead
Down
- 1. When groups agree to stop fighting
- 2. The organs that take in air for your body
- 3. Splitting a number into equal parts
- 4. Repeated addition used to find a total
- 5. A time when there is no fighting
- 8. A tool used to see faraway objects in space
- 10. How living things breathe in oxygen and breathe out carbon dioxide
- 11. Tables The basic facts used for multiplication
- 13. The parliament buildings in Northern Ireland
- 14. What is left over after dividing
- 16. A dark shape made when something blocks light
- 17. A form of energy that helps us see