Across
- 4. The state of matter with a definite shape and volume
- 6. The process of a liquid turning into a gas
- 7. The energy source of the solar system
- 8. The smallest unit of a chemical element
- 14. The spinning of Earth on its axis
- 16. The liquid state of water when it falls from clouds
- 18. The force that pulls objects toward the Earth
- 21. The planet we live on
- 22. An animal that eats only plants
- 23. A push or pull on an object
- 24. The center of an atom
- 25. The basic unit of life
- 26. A vertebrate animal that lays eggs and has feathers
- 28. The process of breaking down food for energy
- 29. The change from gas to liquid
- 30. An animal that eats both plants and meat
Down
- 1. An object that attracts iron
- 2. A substance made of only one type of atom
- 3. A scientist who studies the stars and planets
- 5. A material that allows electricity to pass through
- 9. The outermost layer of the Earth
- 10. The natural satellite of Earth
- 11. The layer of air surrounding Earth
- 12. The process by which a caterpillar becomes a butterfly
- 13. The energy stored in food
- 15. A gas that humans breathe in
- 17. An instrument that measures temperature
- 19. The planet closest to the Sun
- 20. The process by which plants make their own food
- 27. A tool used to see tiny objects