Geography40 Trivia Questions17 Easy · 19 Medium · 4 Hard

Ocean Trivia: 40 Submerged Waterfalls, Rubber Ducks & Deep-Sea Wonders

Forget memorizing basic ocean names—explore 40 wild stories behind 11,500-foot underwater waterfalls, sun-hot shrimp claws, and the planet's deepest marine mysteries.

Where is the largest waterfall on planet Earth actually located?

Question 1 of 40Medium

1.Where is the largest waterfall on planet Earth actually located?

How did 28,800 yellow bath toys spilled in 1992 help oceanographers?

Question 2 of 40Easy

2.How did 28,800 yellow bath toys spilled in 1992 help oceanographers?

What startled explorers Jacques Piccard and Don Walsh inside Challenger Deep in 1960?

Question 3 of 40Medium

3.What startled explorers Jacques Piccard and Don Walsh inside Challenger Deep in 1960?

Roughly how much dissolved gold floats inside the world's ocean water?

Question 4 of 40Medium

4.Roughly how much dissolved gold floats inside the world's ocean water?

How does the widest span of the Pacific Ocean compare to the Moon?

Question 5 of 40Easy

5.How does the widest span of the Pacific Ocean compare to the Moon?

Why do deep-sea submarines sometimes encounter lakes with shorelines on the ocean floor?

Question 6 of 40Medium

6.Why do deep-sea submarines sometimes encounter lakes with shorelines on the ocean floor?

What produces the oxygen for roughly one in every five human breaths?

Question 7 of 40Hard

7.What produces the oxygen for roughly one in every five human breaths?

How could low-frequency fin whale songs cross thousands of miles before shipping noise?

Question 8 of 40Medium

8.How could low-frequency fin whale songs cross thousands of miles before shipping noise?

What causes sailors' 'milky seas' that glow bright enough to spot from space?

Question 9 of 40Medium

9.What causes sailors' 'milky seas' that glow bright enough to spot from space?

How much of Earth's 40,000-mile-long Mid-Ocean Ridge mountain system sits underwater?

Question 10 of 40Easy

10.How much of Earth's 40,000-mile-long Mid-Ocean Ridge mountain system sits underwater?

Why do beachcombers earn fortunes finding waxy gray lumps of whale 'ambergris'?

Question 11 of 40Medium

11.Why do beachcombers earn fortunes finding waxy gray lumps of whale 'ambergris'?

How did marine biologists prove Arctic Greenland sharks live up to 400 years?

Question 12 of 40Medium

12.How did marine biologists prove Arctic Greenland sharks live up to 400 years?

Why does Canada's Bay of Fundy experience fifty-three-foot tides twice every day?

Question 13 of 40Easy

13.Why does Canada's Bay of Fundy experience fifty-three-foot tides twice every day?

How long can a single sunken whale carcass feed deep-sea floor ecosystems?

Question 14 of 40Medium

14.How long can a single sunken whale carcass feed deep-sea floor ecosystems?

Why are the waves in the Drake Passage south of South America monstrous?

Question 15 of 40Medium

15.Why are the waves in the Drake Passage south of South America monstrous?

What will completely consume the iron hull of the RMS Titanic within decades?

Question 16 of 40Easy

16.What will completely consume the iron hull of the RMS Titanic within decades?

What happens when a two-inch pistol shrimp snaps its oversized claw shut?

Question 17 of 40Medium

17.What happens when a two-inch pistol shrimp snaps its oversized claw shut?

When does the largest mass animal migration on planet Earth take place?

Question 18 of 40Easy

18.When does the largest mass animal migration on planet Earth take place?

How did Victorian sailors aboard HMS Challenger first measure the Mariana Trench in 1875?

Question 19 of 40Medium

19.How did Victorian sailors aboard HMS Challenger first measure the Mariana Trench in 1875?

Roughly how many harmless marine viruses float inside a single teaspoon of seawater?

Question 20 of 40Hard

20.Roughly how many harmless marine viruses float inside a single teaspoon of seawater?

How did naval officer Matthew Fontaine Maury shave six weeks off 1850s sailing voyages?

Question 21 of 40Medium

21.How did naval officer Matthew Fontaine Maury shave six weeks off 1850s sailing voyages?

How does the tiny 'immortal jellyfish' escape dying of old age?

Question 22 of 40Easy

22.How does the tiny 'immortal jellyfish' escape dying of old age?

Why did oceanographers dismiss sailors' tales of 85-foot 'rogue waves' until New Year's 1995?

Question 23 of 40Hard

23.Why did oceanographers dismiss sailors' tales of 85-foot 'rogue waves' until New Year's 1995?

How slow does a diving blue whale's car-sized heart beat at deep depths?

Question 24 of 40Easy

24.How slow does a diving blue whale's car-sized heart beat at deep depths?

Why do 2,400-year-old Greek wooden shipwrecks sit perfectly intact on the Black Sea floor?

Question 25 of 40Medium

25.Why do 2,400-year-old Greek wooden shipwrecks sit perfectly intact on the Black Sea floor?

Why is the blood of marine horseshoe crabs bright baby-blue instead of red?

Question 26 of 40Easy

26.Why is the blood of marine horseshoe crabs bright baby-blue instead of red?

Which freezing Southern Ocean fish is the only vertebrate with crystal-clear colorless blood?

Question 27 of 40Hard

27.Which freezing Southern Ocean fish is the only vertebrate with crystal-clear colorless blood?

How fast do tsunami waves travel across the deep open ocean before landfall?

Question 28 of 40Easy

28.How fast do tsunami waves travel across the deep open ocean before landfall?

Why can a ship sail right through the Great Pacific Garbage Patch without noticing?

Question 29 of 40Easy

29.Why can a ship sail right through the Great Pacific Garbage Patch without noticing?

Where does up to seventy percent of tropical white beach sand actually come from?

Question 30 of 40Easy

30.Where does up to seventy percent of tropical white beach sand actually come from?

Where do the Atlantic and Indian Oceans officially meet at Africa's southernmost tip?

Question 31 of 40Medium

31.Where do the Atlantic and Indian Oceans officially meet at Africa's southernmost tip?

Which 'extinct' lobe-finned fish from dinosaur times turned up in a 1938 fish haul?

Question 32 of 40Medium

32.Which 'extinct' lobe-finned fish from dinosaur times turned up in a 1938 fish haul?

How does the chambered nautilus rise and sink without swimming fins?

Question 33 of 40Medium

33.How does the chambered nautilus rise and sink without swimming fins?

How fast can giant kelp forests off California grow in a single sunny day?

Question 34 of 40Easy

34.How fast can giant kelp forests off California grow in a single sunny day?

Which ocean creature produces 230-decibel clicks louder than a rocket launch?

Question 35 of 40Easy

35.Which ocean creature produces 230-decibel clicks louder than a rocket launch?

How many color-detecting photoreceptor types pack a mantis shrimp's compound eyes?

Question 36 of 40Medium

36.How many color-detecting photoreceptor types pack a mantis shrimp's compound eyes?

Roughly how long does one drop of seawater take to ride the global conveyor?

Question 37 of 40Medium

37.Roughly how long does one drop of seawater take to ride the global conveyor?

Besides holding paws while sleeping, what do sea otters keep in underarm skin pockets?

Question 38 of 40Easy

38.Besides holding paws while sleeping, what do sea otters keep in underarm skin pockets?

Which deep-sea predator possesses eleven-inch eyes as big as basketballs?

Question 39 of 40Easy

39.Which deep-sea predator possesses eleven-inch eyes as big as basketballs?

Measured from its seafloor base, which volcano is over a mile taller than Everest?

Question 40 of 40Easy

40.Measured from its seafloor base, which volcano is over a mile taller than Everest?