1. oxygen

  2. calamity

  3. jeopardise

  4. phenomenon

  5. pebble

  6. quartz

  7. volcano

  8. smog

  9. plateau

  10. equator

  11. Antarctic

  12. Mediterranean

  13. pacific

  14. marine

  15. flat

  16. Oceania

  17. peninsula

  18. thermal

  19. hail

  20. thaw

  21. freeze

  22. frigid

  23. tremble

  24. springkle

  25. Celsius

  26. temperature

  27. irregularly

  28. inappropriate

  29. suburb

  30. contaminate

  31. wilderness

  32. lunar

  33. evaporate

  34. circulate

  35. reservoir

  36. petroleum