college and the world

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Across
  1. 4. a chemical element with the symbol Si
  2. 5. unidentified flying object
  3. 7. the study of Earth and the environment
  4. 9. the study of earthquakes
  5. 12. an organism that lives off another organism
Down
  1. 1. the natural science that studies matter
  2. 2. device we use to create and store data
  3. 3. the study of the past
  4. 6. the natural way to grow vegetables
  5. 8. the opposite of singular
  6. 10. a medical technique to see inside the body
  7. 11. the capital city of Norway