Natural phenomenon

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Across
  1. 2. Rapid flow of snow down a mountainside
  2. 3. Severe snowstorm with high winds and low visibility
  3. 4. Injury caused by freezing skin and tissues
  4. 7. Sudden shaking of the ground caused by tectonic shifts
  5. 8. Funnel-shaped rotating column of air touching the ground
  6. 11. Uncontrolled burning in forests or grasslands
  7. 13. Prolonged period of unusually low rainfall
  8. 16. Series of space rocks entering the Earth's atmosphere
  9. 17. Pile of snow shaped by the wind
  10. 19. Huge wave generated by underwater disturbance
  11. 20. Strong tropical cyclone with powerful winds
  12. 22. Event when one celestial body moves into another’s shadow
  13. 23. High-speed winds carrying particles in arid regions
  14. 26. Mountain or hill with lava and ash eruptions
  15. 28. Overflow of water submerging normally dry land
  16. 31. Rapid rotating column of air not attached to a cloud
  17. 32. Ground that remains frozen for two or more years
  18. 33. Tiny frozen particles seen in cold, clear air
  19. 34. Frozen raindrops that fall in showers
  20. 37. Hot water and steam periodically erupting from the ground
  21. 39. Flash of electrical discharge in the atmosphere
  22. 40. White arc caused by small water droplets in the air
  23. 41. Rare phenomenon involving a sphere of luminous energy
  24. 42. Thick cloud of tiny water droplets near the ground
  25. 44. Loud cracking sound in the ground due to rapid freezing
  26. 46. Small whirlwind visible by dust and debris
  27. 48. Extended period of extremely high temperatures
  28. 49. Sudden and brief period of colder temperatures
Down
  1. 1. Large floating mass of frozen water in the ocean
  2. 5. Tropical storm occurring in the Pacific region
  3. 6. Light show visible in southern polar regions
  4. 9. Gradual wearing away of soil and rock
  5. 10. Spinning vortex of flames often seen during intense fires
  6. 12. Intense fire, usually occurring in dry areas
  7. 14. Large, slow-moving masses of ice on land
  8. 15. Tornado occurring over a body of water
  9. 17. Sudden collapse of the ground into a cavity
  10. 18. Flow of wet earth down a slope
  11. 19. Severe weather involving thunder and lightning
  12. 21. Bubbly layer forming on ocean or lake surfaces
  13. 24. Colorful lights often seen near polar regions
  14. 25. Thin layer of ice crystals on surfaces in cold weather
  15. 27. Celestial event where Earth's shadow covers the Moon
  16. 29. Light rain with very small droplets
  17. 30. Optical illusion often seen in deserts or on roads
  18. 35. Sudden downward movement of earth and rock
  19. 36. Seasonal wind pattern bringing heavy rains
  20. 38. Large coastal water surge caused by a natural force
  21. 43. Arc of colors visible in the sky after rainfall
  22. 45. Small water droplets on surfaces in the morning
  23. 47. Celestial event where the Moon blocks the Sun