Layers of the Earth Vocabulary

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Across
  1. 2. a large celestial body that orbits the sun
  2. 6. stage in formation of solar system where matter naturally gathers in to lumps
  3. 9. Origin of the Moon hypothesis that states the Moon was once a part of the Earth and separated from it early in the planet's history
  4. 10. small rocky or metallic fragments in space
  5. 11. gas and dust
  6. 14. When a planetesimal becomes large enough, it becomes a _______
  7. 15. Mercury, Venus, Earth, and Mars are these types of planets
  8. 17. a meteoroid that survives its passage through the Earth's atmosphere and lands on Earth's surface
Down
  1. 1. explosion of a massive star
  2. 3. small bodies collide and combine to make larger ones
  3. 4. "building blocks" of planets -- small solid objects, usually kilometers wide
  4. 5. Origin of Moon hypothesis that states a Mars-sized celestial body collided with the Earth and eventually formed the moon
  5. 7. an icy body composed of water(ice), frozen gases, dust, and organic compounds
  6. 8. caused the nebula to collapse inward towards the center, forming the early Sun
  7. 12. rocky objects that orbit the sun, primarily found in the asteroid belt between Mars and Jupiter
  8. 13. Origin of the Moon hypothesis that states the moon was formed elsewhere in the solar system and was later captured by Earth's gravitational pull
  9. 16. a meteoroid when it is in earth's atmosphere
  10. 18. Jupiter, Saturn, Uranus, Neptune are these types of planets