Value and Line

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Across
  1. 2. found in nature
  2. 3. Grey
  3. 4. using lines to shade
  4. 7. two points connected in space
  5. 8. 3D shape
  6. 10. picture of a group of objects
Down
  1. 1. dark
  2. 3. light
  3. 5. the outside line of an object
  4. 6. has set requirements
  5. 9. light to dark