95 Ocean Trivia Questions and Answers

Are you fascinated by the vast expanses of our planet’s oceans and all the mysteries they hold? The ocean is an incredible, almost otherworldly place filled with intriguing phenomena, magnificent creatures, and intricate ecosystems. It covers more than 70% of the Earth’s surface and yet, a significant portion of it remains unexplored. To celebrate the depth and breadth of the world’s oceans, we’ve curated a list of 100 ocean trivia questions and answers. Test your knowledge, challenge your friends, and dive into the unknown with these intriguing facts about our oceans. Let’s see how many you know already, and how much you’re about to learn! If you want to learn more about our oceans you can check out Ocean Insider.

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1. What is the largest ocean on Earth?

2. What percentage of Earth’s surface is covered by oceans?

3. How deep is the deepest part of the ocean?

4. What is the saltiest sea?

5. What is the least salty ocean?

6. What is the largest living structure on Earth?

7. What percentage of marine species are yet to be discovered?

8. What ocean zone receives the most sunlight?

9. What is the average temperature of the ocean?

10. Which ocean is the smallest?

11. Which country has the longest coastline?

12. What are baby whales called?

13. What is the world’s largest oceanic trench?

14. What percentage of the Earth’s oxygen is produced by the ocean?

15. What is the most common gas dissolved in seawater?

16. What is the largest species of shark?

17. Which ocean is the warmest?

18. Which is the largest sea on earth?

19. What is the main mineral in sea water?

20. How much of the world’s water is contained in the ocean?

21. What ocean surrounds the Bermuda Triangle?

22. What is the longest mountain range in the world?

23. What ocean has the most islands?

24. What is the highest tide recorded and where?

25. What is the largest source of marine pollution?

26. What ocean is the saltiest?

27. What type of ocean wave is caused by an earthquake?

28. Which ocean is the coldest?

29. What are the ‘seven seas’?

30. What is the largest sea creature?

31. What’s the deepest scuba dive ever recorded?

32. What is the largest coral reef?

33. What’s the fastest marine animal?

34. What are ocean currents?

35. What is the main driver of the ocean’s currents?

36. What’s the name of the ocean current that is also known as the ‘Global Conveyor Belt’?

37. What’s the most venomous marine animal?

38. What is bioluminescence?

39. What is the loudest sea creature?

40. What is the average lifespan of a sea turtle?

41. What are ‘right whales’ named after?

42. What are the colors of a coral reef due to?

43. What are hydrothermal vents?

44. What marine creature can regenerate its own limbs?

45. What is the most common type of pollution affecting marine turtles?

46. What is the largest species of penguin?

47. What is the name of the small fish that clean parasites off of other fish?

48. What marine mammal is known for its ‘song’?

49. What causes red tides?

50. What is the average depth of the world’s oceans?

51. What marine creature has the longest lifespan?

52. What causes the ocean’s blue color?

53. Which marine creature is the heaviest on Earth?

54. What is the biggest threat to coral reefs?

55. What does the term ‘pelagic’ mean?

56. What are mangroves?

57. What are kelps?

58. Which creature creates the largest single structure made by living organisms?

59. What’s the only sea without any coasts?

60. What type of fish is Nemo from the movie ‘Finding Nemo’?

61. What’s the largest species of dolphin?

62. What is ‘brackish’ water?

63. What is the ‘Abyssal Zone’?

64. What’s the smallest ocean?

65. What is the ‘Twilight Zone’ in the ocean?

66. What causes ocean tides?

67. What is a group of jellyfish called?

68. What is the name for a large system of rotating ocean currents, particularly those involved with large wind movements?

69. What is a seiche?

70. What is a fjord?

71. What’s the name of the underwater mountain range in the Atlantic Ocean?

72. What’s the term for the study of oceans?

73. What is the name of a young fish?

74. What is the name of the largest oceanic dolphin?

75. What is a group of fish called?

76. What percentage of life on Earth is aquatic?

77. Which ocean is the second largest?

78. What is the Mariana Trench?

79. Which country has the most coral reefs?

80. What’s the oldest ocean?

81. What’s the name of the boundary that separates the lighter surface waters from the deeper, heavier waters?

82. What’s the scientific term for water pressure?

83. What is the ‘Ring of Fire’?

84. What are ocean trenches?

85. What are phytoplankton?

86. What is a riptide?

87. What are zooplankton?

88. What is the Great Barrier Reef?

89. What’s the average salt content in sea water?

90. What’s the name of a famous shipwreck found in the Atlantic Ocean?

91. What is ‘Nurdles’?

92. What’s the largest fish in the ocean?

93. Which fish has the highest number of species?

94. What is the smallest sea?

95. What’s the term for the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes?

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