The Earth

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Across
  1. 3. examines the origin and evolution of earth
  2. 6. remains or traces of once living organisms
Down
  1. 1. theories formulated through a specific scientific process
  2. 2. states that the origin of our solar system involved the condensation and collapse of interstellar material in a spiral arm of the Milky Way Galaxy
  3. 4. tentative explanations to a scientific problem
  4. 5. a model for the evolution of the universe
  5. 7. a combination of related parts that interact in an organized manner