How The Earth Was Formed

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Across
  1. 4. Iron and nickel sank to the center, creating the ____ of the planet
  2. 5. During the Hadean Eon, Earth was under constant bombardment by ____ and experienced intense volcanism
  3. 7. Process in which denser materials of a planet sink to the center, while less dense materials rise to the surface
  4. 8. Gravity pulled in irregular bumps on the surface, causing the formation of a _____ shape
  5. 10. Planets can only separate into layers based on density if the materials are in their _____ form.
  6. 11. The solar system started out as a ____, or cloud of gas, ice, and dust
Down
  1. 1. The surface of Earth cooled and eventually became this
  2. 2. Earth grew in size and began to generate _____ energy
  3. 3. The force that pulled the nebula closer together, forming a flattened disk shape
  4. 5. The "giant impact hypothesis" proposes that the ____ was formed when a large body collided with Earth
  5. 6. Pressure and heat from ____ decay of elements and aftershocks of massive collisions caused Earth to be molten
  6. 8. The materials in the nebula became more dense and formed the _____
  7. 9. ____ began to form as gravity pulled particles closer together