🌊 Ocean trivia for kids

Every answer checked 31 October 2026. Free, no sign-up, nothing to download.

Ocean questions at three ages, almost all of them from NOAA's Ocean Service: how many hearts an octopus has, which is the biggest fish, why the ocean looks blue, where the highest tides are and how deep the ocean is on average.

🐣 Little round: ages 6–8 (grades K–2)

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1.Which is the biggest ocean?
- A the Atlantic Ocean
- B the Pacific Ocean
- C the Arctic Ocean
2.What are hailstones made of?
- A salt
- B ice
- C tiny rocks
3.How many hearts does an octopus have?
- A one
- B eight
- C three
4.What is fog?
- A dust from the road
- B a cloud touching the ground
- C smoke from chimneys
5.What pulls on the ocean to make the tides?
- A the wind and the rain
- B the moon and the sun
- C big whales swimming
6.What is the largest animal that has ever lived on Earth?
- A the African elephant
- B the blue whale
- C the whale shark
7.How does a sea star move around?
- A on tiny tube feet
- B by swishing its tail
- C by flapping fins
8.What is a jellyfish mostly made of?
- A sand
- B water
- C bone
9.What is the biggest fish in the ocean?
- A the swordfish
- B the whale shark
- C the blue whale
10.Penguins have wings, but what do they use them for?
- A swimming
- B climbing
- C digging

🔑 Show the answers

B: the Pacific Ocean. All of the world's continents could fit inside the Pacific. Source: NOAA Ocean Service
B: ice. Hail forms high up inside big thunderstorm clouds where it is very cold. Source: NOAA National Severe Storms Laboratory
C: three. Two of its hearts pump blood to the gills, and one pumps it to the rest of the body. Source: NOAA Ocean Service
B: a cloud touching the ground. If you have walked through fog, you have walked through a cloud. Source: NOAA NESDIS (SciJinks)
B: the moon and the sun. Tides are so regular that people can predict them far ahead of time. Source: NOAA Ocean Service
B: the blue whale. Blue whales eat mostly krill, tiny animals they strain out of the water. Source: NOAA Fisheries
A: on tiny tube feet. A sea star is not a fish at all: it has no gills, scales or fins. Source: NOAA Ocean Service
B: water. Jellyfish have no brain, no blood and no heart. Source: NOAA Ocean Service
B: the whale shark. Even though they are huge, whale sharks are usually calm and gentle. Source: NOAA Ocean Service
A: swimming. All penguins live in the southern half of the world. Source: NOAA Ocean Service

🦊 Middle round: ages 9–11 (grades 3–5)

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1.Where are the highest tides in the world?
- A the Bay of Fundy in Canada
- B the Red Sea
- C the Caribbean Sea
2.Most snowflakes are less than how wide?
- A two inches
- B half an inch
- C six inches
3.Some humpback whales swim about how far between warm and cold waters?
- A about 5,000 miles
- B about 50,000 miles
- C about 50 miles
4.A tornado is a spinning column of air that reaches down from what?
- A a snowbank
- B a thunderstorm
- C a rainbow
5.About how much of Earth's oxygen comes from the ocean?
- A about one-tenth
- B about half
- C almost none
6.What kind of living thing is a coral?
- A a mushroom
- B an animal
- C a plant
7.Which is the smallest of the five oceans?
- A the Arctic Ocean
- B the Southern Ocean
- C the Indian Ocean
8.Which of these has ear flaps you can see?
- A a walrus
- B a seal
- C a sea lion
9.Most countries, including the United States, now count how many named oceans?
- A seven
- B three
- C five
10.Why does the ocean look blue?
- A blue fish tint the water
- B it is full of blue salt
- C water soaks up red light

🔑 Show the answers

A: the Bay of Fundy in Canada. In the United States, the highest tides are near Anchorage, Alaska. Source: NOAA Ocean Service
B: half an inch. Half an inch is about 1.3 centimeters. Source: National Snow and Ice Data Center
A: about 5,000 miles. Humpbacks have one of the longest migrations of any mammal. Source: NOAA Fisheries
B: a thunderstorm. Tornadoes have been reported in all fifty U.S. states. Source: NOAA National Severe Storms Laboratory
B: about half. Most of it is made by tiny drifting plankton near the ocean's surface. Source: NOAA Ocean Service
B: an animal. Corals stay fixed to the sea floor, which is why many people think they are plants. Source: NOAA Ocean Service
A: the Arctic Ocean. The Arctic Ocean is covered with ice for most of the year. Source: NOAA Ocean Service
C: a sea lion. Sea lions can walk on land using their large flippers, while seals wriggle on their bellies. Source: NOAA Ocean Service
C: five. The Southern Ocean around Antarctica is the newest one to get a name. Source: NOAA Ocean Service
C: water soaks up red light. Deep down, most of the ocean is completely dark. Source: NOAA Ocean Service

🦉 Big round: ages 12 and up (grades 6 and up)

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1.The Great Barrier Reef is made up of nearly how many individual reefs?
- A about 3,000
- B about 30
- C about 300,000
2.Winds blowing in different directions or speeds at different heights are called what?
- A the jet stream
- B trade winds
- C wind shear
3.Octopus blood is blue because its oxygen-carrying protein contains which metal?
- A iron
- B copper
- C silver
4.A storm officially becomes a hurricane when its winds reach what speed?
- A 74 miles per hour
- B 39 miles per hour
- C 200 miles per hour
5.Spring tides happen around which phases of the moon?
- A waxing and waning crescent
- B new moon and full moon
- C first and third quarter
6.Which tiny ocean bacterium, the smallest photosynthetic organism on Earth, makes up to 20% of our oxygen?
- A Streptomyces
- B Prochlorococcus
- C Lactobacillus
7.What is the deepest known part of the ocean called?
- A the Java Trench
- B the Puerto Rico Trench
- C the Challenger Deep
8.What is the average depth of the ocean?
- A about 36,820 meters
- B about 368 meters
- C about 3,682 meters
9.In most sea turtles, what decides whether a hatchling is male or female?
- A the temperature of the eggs
- B the phase of the moon
- C the size of the eggs
10.Stony coral polyps build reefs from skeletons made of what?
- A silica
- B calcium carbonate
- C keratin

🔑 Show the answers

A: about 3,000. It stretches for about 1,429 miles off the coast of Queensland, Australia. Source: NOAA Ocean Service
C: wind shear. Wind shear helps set up the spinning air inside storms that can form tornadoes. Source: NOAA NESDIS (SciJinks)
B: copper. The protein is called haemocyanin; human blood uses iron-based haemoglobin. Source: Natural History Museum, London
A: 74 miles per hour. At 39 miles per hour, a storm is first called a tropical storm. Source: NOAA NESDIS (SciJinks)
B: new moon and full moon. The name comes from the tide 'springing forth,' not from the season. Source: NOAA Ocean Service
B: Prochlorococcus. Most of the ocean's oxygen comes from drifting plankton like this. Source: NOAA Ocean Service
C: the Challenger Deep. It lies at the southern end of the Mariana Trench in the western Pacific. Source: NOAA Ocean Service
C: about 3,682 meters. That is about 12,080 feet, more than two miles down. Source: NOAA Ocean Service
A: the temperature of the eggs. Scientists call this temperature-dependent sex determination, or TSD. Source: NOAA Ocean Service
B: calcium carbonate. Most stony coral polyps are only one to three millimeters across. Source: NOAA Ocean Service

For the host

The whale shark question catches grown-ups too: a blue whale is bigger, but it is not a fish.

Read each question and its three answers aloud, or press ▶ Play and Peabody reads them; a tap shows the answer, a line about it and where it comes from.
On a phone, pass it round: one question per team, a star for each right answer. On a laptop or a TV, press 📺 Big screen.
On paper, print the cards, one answer sheet per team and the key on its own page.

Where these questions come from

Each question was written by Peabody in its own words and checked against one page, named under its answer. The pages we used for these rounds:

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