Across
- 2. A group of four singers or musicians
- 5. Another name for the Celsius scale
- 7. To divide into three equal parts
- 8. A large black and orange butterfly
- 9. A four-line stanza in poetry
- 11. A contest with ten athletic events
- 12. A group of three rulers
- 13. A group of three related books or movies
Down
- 1. One-fourth of a circle
- 3. A 200th anniversary
- 4. destroy a large part
- 6. A 100th anniversary
- 10. Having two sides