Unit 3, Lessons 1 and 2 Grade 8

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Across
  1. 3. middle layer in three layer model of Earth
  2. 8. he proposed the theory of continental drift
  3. 14. Earth's three layer model is based on _____
  4. 16. energy released by an earthquake
  5. 18. outermost physical layer of Earth
  6. 21. made of solid iron and nickel
  7. 22. a type of evidence for continental drift
  8. 24. Earth is believed to be about 4.6 _______years old
  9. 25. separation based on density
  10. 27. the force that pulls matter towards Earth's center
Down
  1. 1. the only liquid layer of Earth
  2. 2. source of heat in Earth
  3. 4. pieces of the lithosphere
  4. 5. the area affected by a force
  5. 6. low density minerals in Earth's crust
  6. 7. a process in which new ocean floor is made
  7. 9. most dense layer in three layer model
  8. 10. the supercontinent of the past
  9. 11. an underwater mountain range
  10. 12. a rock from Earth's mantle
  11. 13. outer layer in compositional model of Earth
  12. 15. the type of seismic wave that can travel through the core
  13. 17. one plate moves beneath another plate
  14. 19. the denser type of crust
  15. 20. the thicker type of crust
  16. 23. the middle layer in the five layer model
  17. 26. the type of seismic wave that travels only through solids