Hard Crossword Puzzle

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Across
  1. 4. simplest structural unit of an element or compound
  2. 5. something that is likely to change
  3. 7. the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water
  4. 11. one of several distinct subdivisions of a text
Down
  1. 1. a representation of a person's thinking with symbolic marks
  2. 2. a parallelogram with four right angles
  3. 3. a small celestial body composed of rock and metal
  4. 6. the abstract science of number, quantity, and space
  5. 8. a practical method or art applied to some particular task
  6. 9. relating to the sun or utilizing the energies of the sun
  7. 10. evaluation of performance by assigning a score