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Across
  1. 3. The amount of space inside a 3D shape
  2. 4. The distance around a shape
  3. 6. Made to suit your environment
  4. 7. Friendly countries that may work together for military purposes
  5. 8. The murder of Jews and others during WW2 with the intent of wiping out their nationality
  6. 10. A person who chooses to serve in the military
Down
  1. 1. Sorting based on similarities
  2. 2. A person called by their government to serve in the military
  3. 5. Variety, unique, different
  4. 9. Name given to Germany and their allies during WW2