Architecture Crossword - 3

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Across
  1. 3. Ornamental architecture of furniture style
  2. 5. very old, so valuable
  3. 6. A national tree of USA, symbolising strength and endurance
  4. 7. curved line part of a circle
Down
  1. 1. An entrance to a house or room
  2. 2. A round building with a dome
  3. 3. a curved bone of chest
  4. 4. a noble gas used in producing coloured lights