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Across
  1. 3. change: it is human-caused or anthropogenic
  2. 8. Theory: proposed by Georges Lemaitre
  3. 9. galaxies: spherical or elongated galaxies
  4. 13. destructive plate margins
  5. 14. spiral galaxy: variation of the spiral galaxy
  6. 15. proposed the continental drift theory
  7. 17. emerged from rising molten rocks
  8. 18. tectonics theory: earth's surface is not a static and intact structure
  9. 19. Have the greatest contribution to global warming
  10. 21. storm: one of the natural sources of aerosols
  11. 22. galaxies: flat, disk-shaped galaxies
  12. 23. clusters: gravitationally bound clusters
  13. 24. fine liquid and solid particles
  14. 27. larger groups of galactic clusters
  15. 31. law: law that states galaxies recede at speeds proportional to their distances from the observer
  16. 33. single supercontinent
  17. 34. Milky Way's nearest neighboring spiral galaxy
  18. 37. galaxies: no distinct symmetry compared to spiral and elliptical galaxies
  19. 38. fission: H2O combine with another atom to form helium
  20. 39. imaginary path around the planets
Down
  1. 1. rainfall: can wash out pathogens
  2. 2. warming: increase in the average global temperature
  3. 4. plate: one of the tectonics plate
  4. 5. fault: conservative plate margins
  5. 6. constructive plate margins
  6. 7. collection of start
  7. 10. clearing of forests
  8. 11. tallest mountain on earth
  9. 12. birthplace of the stars
  10. 16. deepest trench
  11. 20. Way: example of spiral galaxy
  12. 25. large volumes of ocean water
  13. 26. effect: the ability to absorb and hold heat in the atmosphere
  14. 28. gases:gases that contributes to greenhouse effect
  15. 29. region in space where gravity is strong
  16. 30. group: galactic cluster
  17. 32. largest plate
  18. 35. matter: undetectable form of matter
  19. 36. dioxide: transparent to incoming solar radiation