Earth's Early History Vocab

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Across
  1. 2. a small rocky body orbiting the sun
  2. 4. A developing star before it begins nuclear fusion
  3. 8. The process of smaller bodies colliding and sticking together to form larger bodies
  4. 9. A small body formed in the early solar system, ranging from dust sized to moon sized objects
  5. 11. dating A method of determining the age of rocks using radioactive isotopes
  6. 12. Record The accumulation of geological materials that forms Earth's crust
  7. 13. bombardment A period of intense meteor impacts in the early solar system
Down
  1. 1. An early stage in the formation of a planet
  2. 3. Decay The spontaneous breakdown of an unstable atomic nucleus
  3. 5. Rocks rocks from the moon
  4. 6. The ejection of molten rock onto the Earth's surface.
  5. 7. accretion The process by which planets form through the accumulation of smaller bodies
  6. 10. disk A rotating disk of gas and dust surrounding a forming star