Classification of shapes

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Across
  1. 3. Describes a shape that is not man-made
  2. 5. Having one element or parts
  3. 8. Exists in real life, having length, width, and depth
Down
  1. 1. Shapes which are flat, lacking depth
  2. 2. The outside part of a shape
  3. 4. Constructed from regular shapes and straight lines
  4. 6. Formed organically, not with regular shapes and lines
  5. 7. Having multiple elements
  6. 9. A shape that is man-made is ________