Periods 3 & 6 Crossword

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Across
  1. 2. the system of interacting, living organisms on Earth
  2. 5. the movement of energy through air & space
  3. 6. the supercontinent before continents drifted
  4. 7. large, bright Sun features extending outward from surface
  5. 9. the force holding planets & Moons in orbit
  6. 10. where life & weather happens in atmosphere
  7. 12. the system of gas surrounding Earth
  8. 15. a law that determines oldest rocks are below youngest rocks
  9. 18. cooling & solidifying of molten rock creates . . .
  10. 20. layer of Earth that's broken into plates
  11. 21. layer of protection from UV rays around Earth
  12. 23. the Moon getting smaller
  13. 25. Earth center model
  14. 26. the gravitational pull of the Moon causes these
  15. 31. heat & pressure applied to previous rock creates . . .
  16. 32. the system of natural, nonliving materials on Earth
  17. 33. the system of ice on Earth
  18. 35. type of energy transfer between rising & falling of fluids
  19. 36. eruptions of radiation on the Sun
  20. 37. a fracture/break in land
  21. 38. darker spots on the Sun
  22. 39. the settlement of rock in a new place
  23. 43. an absolute dating technique
  24. 44. determines locations East & West
  25. 46. where convection happens in Earth's mantle
  26. 48. energy from the Sun is considered this
  27. 50. the movement of rock by wind, water, or gravity
  28. 51. determines locations North & South
Down
  1. 1. the outer part of Sun's atmosphere
  2. 3. the system of water on Earth
  3. 4. the breakdown of rock
  4. 8. boundary where two plates pull apart
  5. 11. the absence of day
  6. 12. length of distance between Earth & Sun
  7. 13. anything that takes up space & has mass (comes in 3 forms)
  8. 14. Sun center model
  9. 16. the source of day
  10. 17. the movement of air
  11. 19. study of rock layers
  12. 20. distance light travels within a year
  13. 22. revolves around Earth and shows different phases
  14. 24. compaction of sediments creates . . .
  15. 27. the Moon less than half lit
  16. 28. the Moon more than half lit
  17. 29. evidence of prehistoric organisms
  18. 30. the amount of matter per space taken up
  19. 34. spinning on an axis
  20. 40. boundary where two plates push together
  21. 41. an effect that keeps Earth warm
  22. 42. where the ozone layer is
  23. 45. when an isotope changes from parent to daughter
  24. 47. boundary where two plates slide past each other
  25. 49. the Moon getting bigger