Early Earth Formation Events

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Across
  1. 4. This process began when Earth formed and ended about 3.8 bya
  2. 8. The process by which Earth's outermost layers move about the surface
  3. 9. Early rock samples have been found on Earth brought here by ______
  4. 10. When Earth cooled, this dense layer formed at the center of Earth
  5. 12. A period in time defined by the earliest life on Earth
  6. 13. Oldest mineral on Earth found in Australia
  7. 17. A period of Earth's past when Earth was constantly colliding with Meteorites
  8. 18. Also known as lunar rocks, helped age Earth
  9. 19. This force pulled the early solar system materials together to form planets
Down
  1. 1. The process that Earth and the other planets formed by
  2. 2. The _____ _____ s about 4.6 byo
  3. 3. This is a process used to find the exact age of rocks based on radioactive isotopes
  4. 5. Earth's outermost layer
  5. 6. is 4.54 billion years old
  6. 7. The separation of Earth into layers based on density
  7. 11. A period in Earth's history when Earth was extremely hot
  8. 14. Formed when a Mars-sized body collided with Early Earth
  9. 15. Early Earth was extremely hot partially due to ______ materials
  10. 16. The Acasta Gneisses were found in this country