Circles In Life

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Across
  1. 1. Circular, coloured part of the eye
  2. 4. The curved path a planet takes
  3. 7. Round form of currency
  4. 8. Victorian bike with one large wheel
  5. 10. A large Roman amphitheatre
  6. 11. Rings inside the trunk of a tree can be used to find out the tree's ...
  7. 12. The inventors of geometry
Down
  1. 2. The most famous stone circle site
  2. 3. Name of spikes on chariot wheels
  3. 5. Leaning tower with circular cross section
  4. 6. Was first invented make pottery
  5. 9. Was believed to be flat until the 5th century BC