Across
- 2. Mercury, Venus, Earth, Mars.
- 3. Spilled oil can block this from getting into the water.
- 7. Largest Ocean.
- 9. A metal with a low melting point.
- 10. Rockets need their own supply of this.
- 11. A way to reduce water and air resistance.
- 14. Tiny marine animals that use calcium carbonate.
- 18. Can help a rocket get off the ground.
- 20. Friction always _____ a moving object.
- 22. One of the three Rs.
- 23. Percentage of Earth that is “blue”.
- 24. A type of water pollution.
- 25. The lightest zone.
- 27. Most common metal in Earth’s crust.
- 28. A property of metals.
- 29. The heating effect of friction changes some _________ energy into heat energy.
- 30. It keeps us down.
Down
- 1. distance between Earth and Mars.
- 4. You may feel a lot of this in the midnight zone.
- 5. __________ plastics can decompose more easily.
- 6. Yet another property of metals.
- 8. Mostly made of rock and ice.
- 12. A push or pull.
- 13. The amount of matter in an object.
- 15. A common liquid rocket fuel.
- 16. Magnetism is an example of this type of force.
- 17. Many of these in between Mars and Jupiter.
- 19. Too many people.
- 21. For Earth: The Moon.
- 23. The second largest gas giant.
- 26. A property of plastics.