End of the Year Earth Science Crossword

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Across
  1. 3. The line of 0° longitude passing through Greenwich, England
  2. 7. Light from an object moving away from Earth
  3. 11. The slightly flattened shape of Earth
  4. 13. A device that proves Earth's rotation
  5. 14. A tool that breaks light into a spectrum of colors
  6. 15. A rocky planet, like Earth or Mars
  7. 20. The curving of winds and ocean currents due to Earth's rotation
  8. 24. Events caused by shadows cast by the Earth
  9. 26. The rate of change in a field value
  10. 31. Any object that orbits a planet, natural or man-made
  11. 32. The Sun and all objects that orbit it
  12. 34. The point directly above an observer’s head
  13. 38. A large group of stars, dust, and gas held together by gravity
  14. 41. Lines that measure distance north or south of the Equator
  15. 42. The distance light travels in one year
  16. 43. The line where the sky meets the ground
  17. 46. The time of day when the Sun is highest in the sky
  18. 48. The southernmost point on Earth
  19. 49. Icy objects that produce a glowing tail as they orbit the Sun
  20. 50. The day when daylight and nighttime are equal
  21. 52. The perceived movement of objects in the sky
  22. 53. A measure of how stretched an orbit is
  23. 55. Sunlight that hits Earth at a 90-degree angle
  24. 57. The layer of the atmosphere above the troposphere
  25. 61. Natural objects in the sky, like stars, planets, and moons
  26. 62. The boundary between the troposphere and stratosphere
  27. 64. The boundary between the stratosphere and mesosphere
  28. 65. The speed of an object
  29. 66. A massive ball of gas undergoing nuclear fusion
  30. 67. The lowest layer of Earth’s atmosphere
  31. 69. A Sun-centered model of the solar system
  32. 70. An Earth-centered model of the solar system
  33. 71. Earth’s natural satellite
Down
  1. 1. The theory that explains the origin of the universe
  2. 2. Closest point in a planet’s orbit around the Sun
  3. 4. The northernmost point on Earth
  4. 5. The atmospheric layer where meteors burn up
  5. 6. Lines that measure distance east or west of the Prime Meridian
  6. 8. The boundary between the mesosphere and thermosphere
  7. 9. A line connecting points of equal temperature
  8. 10. The average level of the ocean’s surface
  9. 12. Earth’s solid outer layer
  10. 16. The outermost atmospheric layer with very high temperatures
  11. 17. Fixed points that determine the shape of an ellipse
  12. 18. A region where the same standard time is used
  13. 19. A recognizable group of stars forming a pattern
  14. 21. The changing appearance of the Moon as it orbits Earth
  15. 22. The path a planet takes around the Sun
  16. 23. A space rock that hits Earth’s surface
  17. 25. The layer of gases surrounding Earth
  18. 27. The galaxy that contains our solar system
  19. 28. The day with the most daylight in the Northern Hemisphere
  20. 29. A line connecting points of equal air pressure
  21. 30. A line connecting points of equal value
  22. 33. A tool used to measure the altitude of stars
  23. 35. All of Earth’s water
  24. 36. All of space, time, and matter
  25. 37. An imaginary line halfway between the North and South Poles
  26. 39. The line that separates one calendar day from the next
  27. 40. The latitude where the Sun is directly overhead on December 21
  28. 44. A star located above Earth’s North Pole
  29. 45. A gas giant, like Jupiter or Saturn
  30. 47. The day with the least daylight in the Northern Hemisphere
  31. 51. Tides caused by the alignment of the Sun and Moon
  32. 52. A region of space between Mars and Jupiter with many small rocky objects
  33. 54. The latitude where the Sun is directly overhead on June 21
  34. 56. A force of attraction between objects
  35. 58. Caused by Earth’s tilt and revolution around the Sun
  36. 59. Earth’s yearly orbit around the Sun
  37. 60. The spinning of Earth on its axis, causing day and night
  38. 63. The height of a celestial object above the horizon
  39. 68. The process that powers stars by combining hydrogen into helium