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Across
  1. 6. the process of making air, water, soil etc dangerously dirty and not suitable for people to use, or the state of being dangerously dirty
  2. 8. to know and understand something, or suddenly begin to understand it
  3. 9. to know the meaning of what someone is telling you, or the language that they speak
  4. 10. a picture obtained by using a camera and film that is sensitive to light
  5. 11. a process in which you test a new idea or method to see if it is useful or effective
Down
  1. 1. the state of being able to do something
  2. 2. an object that provides a supply of electricity for something such as a radio, car, or toy
  3. 3. one of four equal parts into which something can be divided
  4. 4. a thin paper cover in which you put and send a letter
  5. 5. to give someone the courage or confidence to do something
  6. 7. about or relating to science, or using its methods