Brainteaser

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Across
  1. 3. Art movement focused on light and color
  2. 9. Ancient citadel in Athens
  3. 10. Composer of the "Moonlight Sonata"
  4. 13. Ancient Egyptian writing system
  5. 16. Tree that doesn't lose leaves seasonally
  6. 18. Ill-fated ship that sank in 1912
  7. 23. Imaginary line around the middle of Earth
  8. 25. Physicist known for theory of relativity
  9. 27. Temperature scale named after Swedish astronomer
  10. 29. Large wave caused by seismic activity
  11. 30. Element used in old thermometers
  12. 31. Largest hot desert in the world
  13. 32. Musical instrument with 88 keys
  14. 34. Communication system using dots and dashes
  15. 37. System of government by the people
  16. 39. Digital cryptocurrency
  17. 41. Artist of the Mona Lisa
  18. 44. Snow mass rushing down a mountainside
  19. 45. Long-distance running event
  20. 49. Longest river in South America
  21. 50. Second planet from the Sun
Down
  1. 1. Preserved remains of ancient life
  2. 2. Process by which plants make food
  3. 4. Largest land mammal
  4. 5. Tiny marine animals that build reefs
  5. 6. Japanese dish often involving raw fish
  6. 7. Period of cultural rebirth in Europe
  7. 8. Economic increase in prices over time
  8. 11. Process of converting waste into reusable material
  9. 12. Ancient amphitheater in Rome
  10. 14. Element essential for breathing
  11. 15. English playwright and poet
  12. 17. Seat of Russian government
  13. 19. Famous mausoleum in India
  14. 20. Highest mountain in the world
  15. 21. Substance to stimulate immunity
  16. 22. Hormone that regulates blood sugar
  17. 24. Period of cultural rebirth in Europe
  18. 26. Ancient Egyptian tomb structure
  19. 28. Indian independence leader
  20. 33. Classical dance form
  21. 35. Japanese art of paper folding
  22. 36. Complete set of an organism's DNA
  23. 38. Egg-laying mammal with a duck-like bill
  24. 40. Scientist who proposed theory of evolution
  25. 42. Ancient supercontinent
  26. 43. French emperor and military leader
  27. 46. Epic poem attributed to Homer
  28. 47. Fundamental particle in physics
  29. 48. Capital of France