Disciplines and jobs

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Across
  1. 4. the science that is concerned with studying the structure of substances and the way that they change or combine with each other
  2. 8. someone who studies or teaches mathematics, or is a specialist in mathematics
  3. 9. the science concerned with the study of physical objects and substances
  4. 10. someone who studies or works in biology
  5. 12. to study or think about something carefully
  6. 13. a scientist who studies the stars and planets
Down
  1. 1. the act of travelling through a place in order to find out about it
  2. 2. a scientist who has special knowledge and training in physics
  3. 3. the scientific study of the stars and planets
  4. 5. a way of solving a problem or dealing with a difficult situation
  5. 6. a scientist who has special knowledge and training in chemistry
  6. 7. someone who travels through an unknown area to find out about it
  7. 11. to find or provide a way of dealing with a problem