Science one-word quiz

Write a one-word answer for each question.

1. Animals without a backbone are called

2. Bases turn red litmus paper this colour

3. The instrument used to measure temperature

4. The layer of air around the Earth

5. The planet closest to the Sun

6. Water vapour changing back into liquid water

7. The planet we live on

8. The organ we use for hearing

9. The pigment in red blood cells that carries oxygen

10. The study of stars and planets

11. A reddish-brown metal used in electric wires

12. The gas we breathe in to stay alive

13. The star at the centre of our solar system

14. The change of a solid directly into a gas

15. Animals that eat only other animals are called

16. The SI unit of electric current

17. The positively charged particles in the nucleus of an atom

18. Blood vessels that carry blood away from the heart

19. The process by which green plants make their food

20. The process by which a seed starts to grow into a plant

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