Unit 3, Lessons 1 and 2 Grade 8. Use the textbook and work independently while completing this puzzle.

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Across
  1. 2. the denser type of crust
  2. 5. travels through solids and liquids
  3. 6. low density minerals in Earth's crust
  4. 8. a type of evidence for continental drift
  5. 11. the force that pulls matter towards Earth's center
  6. 12. made of liquid metal
  7. 14. a rock from Earth's mantle
  8. 16. an underwater mountain range
  9. 17. pieces of the lithosphere
  10. 20. middle layer in 3-layer model of Earth
  11. 21. outermost physical layer of Earth
Down
  1. 1. Earth is believed to be about 4.6 _______years old
  2. 3. made of solid iron and nickel
  3. 4. energy from earthquakes
  4. 7. outer layer in 3-layer model of Earth
  5. 9. one plate moves beneath another plate
  6. 10. the supercontinent of the past
  7. 13. proposed the theory of continental drift
  8. 15. the area affected by a force
  9. 18. most dense layer in three layer model
  10. 19. separation based on density
  11. 20. the middle layer in the five layer model