Unit 3, Lessons 1 and 2 Grade 8

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Across
  1. 5. most dense layer in three layer model
  2. 7. separation based on density
  3. 8. the middle layer int he five layer model
  4. 9. low density minerals in Earth's crust
  5. 12. the denser type of crust
  6. 13. made of solid iron and nickel
  7. 14. the force that pulls matter towards Earth's center
  8. 15. the only liquid layer of Earth
Down
  1. 1. Earth is believed to be about 4.6 _______years old
  2. 2. outer layer in compositional model of Earth
  3. 3. outermost physical layer of Earth
  4. 4. Earth's three layer model is based on _____
  5. 6. middle layer in three layer model of Earth
  6. 10. source of heat in Earth
  7. 11. energy released by an earthquake