G7 REVIEW

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