51. El Niño is associated with:
Ocean water temperature
52. Which is the highest mountain in the world regardless of its base location?
53. Which is the the world's deepest mine?
Mponeng Gold Mine
Savuka Gold Mine
54. Which mountain has earth's greatest vertical drop?
55. Which is the largest accidental oil spill in history?
Gulf War oil spill
Ixtoc I oil spill
56. Which is the highest mountain peak in North America?
Mount Saint Elias
Pico de Orizaba
57. Which is the highest city in the world?
58. Which country has the largest uranium reserves in the world?
59. Which is the world’s second largest lake?
Great Slave Lake
60. Which is the deepest lake in the world?
Great Bear Lake