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![Dark deep sea water and rocks]()
1. What was the length of the largest giant squid ever recorded?
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![Icebergs visible above surface of water]()
2. How much of an iceberg is submerged underwater?
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![Pacific coastline sunset with palm trees and a bench]()
3. Which of Earth's oceans is the largest?
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![Silhouette of an ocean diver]()
4. At what depth can divers no longer see the colors red or yellow?
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![Underwater rock formation with fish swimming above divers]()
5. How many marine species are currently known to exist?
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![Aerial view of ocean rock formation on surface of water]()
6. Where is the ocean's deepest known point?
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![Close up of two fish in an undersea kelp forest]()
7. What is the most kelp can grow in a day?
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![Kauai, Hawaii mountain peaks rising out of ocean]()
8. What is the tallest underwater mountain?
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![Digital screen displaying sound wave/volume]()
9. How much faster does sound travel in the ocean than on air?
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![Palm trees with beach and bright blue sky]()
10. How much of the oxygen that we breathe in is produced by aquatic life?
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![Aerial shot of an Indian Ocean shore with a dock and a small group of people]()
11. Which of the Earth's oceans has the hottest surface temperature?
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![Vintage plane photo taken from tail end of vehicle]()
12. In which year did Amelia Earhart become the first woman to fly solo across the Atlantic Ocean?
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![Rows of plastic bottles discared on a beach next to a pier]()
13. Approximately how much trash is dumped into the oceans annually?
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![Aerial view of erupting volcano featuring an ash cloud]()
14. What percentage of the world's active volcanos are located in the Pacific Ocean's Ring of Fire?
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![View of lights on Earth from space at night]()
15. True or False: Earth is the only known planet to have oceans.
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![Nighttime photo of dozens of shipping containers stacked on a cargo ship]()
16. How many shipping containers are lost at sea every year?
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![Close up image of several jellyfish]()
17. What is the most efficient ocean creature?
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![Close up of a large gray shark in black water]()
18. How many known species of sharks exist?
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![Coins actively being dropped onto wooden table]()
19. What is the approximate value of the sunken treasure in the world's oceans?
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![Whale tail splashing back into the ocean]()
20. What is the largest animal to ever live on planet Earth?
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![Orange sunrise over remote ocean]()
21. What is the name of the point in the ocean that is farthest from any shoreline?
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![Polar ice cap landscape with water and mountains]()
22. True or False: The oceans contain 50 times more carbon than Earth's atmosphere.
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![Ocean wave photo]()
23. How fast does the average tsunami travel?
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![Close up of yellow coral in a purple coral bed]()
24. True or False: Coral cannot protect itself from the sun's rays, often causing it to get sunburned.
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![Sandbar in the middle of reef with bright blue water]()
25. Which ocean feature can be seen from the moon?
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![Dark, foreboding sky and ocean shoreline]()
26. How big was Megalodon?
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![Image taken through the side of a wave, creating a circle]()
27. When was the largest underwater volcano discovered?
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![Starfish in the sand on a beach]()
28. What phylum do sea stars belong to?
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![Colorful town on the Gulf of Mexico shoreline]()
29. Which type of tide has one instance of high water and one instance of low water daily?
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![Sunset over the ocean with heart drawn in sand]()
30. When is World Oceans Day?
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![Black and white image of ocean's surface with moon above it]()
31. How far down in the ocean can light travel?
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![Lightbulb laying on black chalkboard]()
32. How much of the ocean's energy would be needed to power the globe?
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![Golden water with ripples]()
33. How much gold is estimated to be in the ocean's water?
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![Shark silhouette taken from below]()
34. What are the odds of a human getting attacked by a shark?
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![Ocean sunset with orange and purple sky]()
35. How much of the ocean remains unexplored?
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![Blue water and beach with shipwreck]()
36. How many shipwrecks can be found off of the Florida Keys?
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![Elevated island huts over bright blue water]()
37. True or False: The Pacific Ocean has about 10,000 islands.
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![Man rescuing two young octopi from beach]()
38. How many brains does an octopus have?
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![dolphin]()
39. How many species of dolphins are there?
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![True or false: The ocean contains more microplastic than the Milky Way does stars.]()
40. True or false: The ocean contains more microplastic than the Milky Way does stars.
Earth's oceans are fascinating and, all too often, misunderstood. This quiz is designed to test your knowledge about the Blue Planet and teach you some fun facts you may not have known before. By the final question, you'll know more about aquatic life and understand some of the things you can do to save the oceans for future generations!