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Across
  1. 6. Rock formed from cooled lava
  2. 7. Rock formed by heat and pressure
  3. 11. Sudden shaking of the ground
  4. 16. Burning of fossil fuels
  5. 17. Plate boundary that slides past
  6. 18. Trapped heat in Earths atmosphere
  7. 20. Rock formed from sediments
  8. 21. Force that pulls objects toward Earth
  9. 22. Earths natural satellite
  10. 25. Long term change in climate
  11. 29. Hottest planet
  12. 31. Release of magma from a volcano
  13. 32. Opening where magma escapes
  14. 33. Volcanic ash cloud
  15. 35. Moving air
  16. 36. Planet with rings
  17. 40. Center star of our solar system
  18. 41. Increase in Earths temperature
  19. 42. Plate boundary that moves apart
  20. 44. Bowl shaped top of a volcano
  21. 46. Cutting down of trees
  22. 47. All water on Earth
  23. 48. Plate boundary that collides
Down
  1. 1. Protects Earth from UV rays
  2. 2. All living things on Earth
  3. 3. Frozen rain
  4. 4. Pattern of stars in the sky
  5. 5. Harmful gases in air
  6. 8. Energy from underground heat
  7. 9. Water from clouds
  8. 10. Path of a planet around the sun
  9. 12. Solid materials from eruption
  10. 13. Process plants use to make food
  11. 14. Innermost layer of Earth
  12. 15. Giant ball of hot gas in space
  13. 19. Molten rock beneath Earths surface
  14. 22. Thick layer below the crust
  15. 23. Movement of Earths plates
  16. 24. Scientist who studies weather
  17. 26. Study of weather
  18. 27. Movement of rock by wind or water
  19. 28. Layer of Earth where we live
  20. 30. Device used to measure earthquakes
  21. 32. Scientist who studies volcanoes
  22. 34. Red planet
  23. 37. Molten rock that flows on the surface
  24. 38. Largest planet
  25. 39. Breaking rocks into smaller pieces
  26. 43. Layer of gases around Earth
  27. 45. Related to earthquakes