Across
- 3. which is the largest organ of the human body
- 5. a liquid to a solid
- 8. which is the strongest bone in the human body
- 9. which gas is essential for breathing
- 11. the largest land animal
- 14. turning materials that otherwise would become waste into valuable resources
- 17. discovered the theory of gravity and the three laws of motion
- 19. organ used to pump blood
Down
- 1. these reptiles don't have legs
- 2. the ability to do work
- 4. what is the invisible force that pulls objects toward each other called
- 6. largest planet in the solar system
- 7. the skeleton is made up of these
- 10. spring, summer, fall, winter
- 12. bees collect and use nectar to create this
- 13. primary source of energy on Earth
- 15. a secret or disguised way of writing; a code
- 16. where does our food collect after we chew and swallow
- 18. number of plants in the solar system