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Across
  1. 7. - Organic compounds consisting entirely of hydrogen and carbon.
  2. 8. - A condition in which the body loses heat faster than it can produce it, leading to a dangerously low body temperature.
  3. 9. - The total mass of organisms in a given area or volume.
  4. 10. - A type of telescope that uses lenses to form images of distant objects.
  5. 11. - Relating to the interaction between electric and magnetic fields.
  6. 13. - The number and appearance of chromosomes in the nucleus of a eukaryotic cell.
  7. 14. - The visible surface of the Sun or another star.
  8. 15. - High-energy electromagnetic radiation emitted from radioactive substances.
Down
  1. 1. - The study of the interaction of light with matter.
  2. 2. - A regularly recurring sequence of events or processes.
  3. 3. - Capable of being broken down by natural processes or organisms.
  4. 4. - A microscopic pathogen that can infect living organisms and replicate inside host cells.
  5. 5. - Relating to the continent of Antarctica or its climate.
  6. 6. - The study of inland waters such as lakes and rivers.
  7. 12. - The process by which rocks change from one type to another due to pressure and temperature changes.