Formation of the Earth

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Across
  1. 2. the atmosphere and ocean are both ______
  2. 7. The photosynthetic life in (*) lead to current compositions of the ____ and oceans.
  3. 10. As the Earth continued to grow its gravitational pull starts to be able to hold onto heavier elements and molecules such as nitrogen (N2) and ______.
  4. 11. The photosynthetic life in (*) emitted _____ as a waste product.
Down
  1. 1. the atmosphere is a ___
  2. 3. the oceans are ______
  3. 4. % of nitrogen in the atmosphere.
  4. 5. % of oxygen in the atmosphere
  5. 6. dioxide Eventually photosynthetic life evolves to use the abundant ______ in the atmosphere for growth (*).
  6. 8. As the planet cooled water precipitated and formed the early ____.
  7. 9. first atmosphere was probably comprised of ____ and Helium.