A surprisingly little-known collection of trivia quizzes and fun facts about the sea
The ocean covers most of the Earth and is very important to our lives.
Many different creatures live in the sea, and fish and seaweed are also part of our diet.
Furthermore, the ocean has a major impact on the climate.
In the ocean, there are places where freshwater and seawater mix.
For living things, the sea is a special habitat.
Here, we introduce general trivia quizzes and fun fact questions related to the ocean.
In the deep parts of the sea, there are still many undiscovered creatures and secrets! Learning more about the ocean helps us feel the importance and vastness of nature.
Please take an interest and explore the world of the sea through these quizzes!
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Surprisingly Little-Known Sea Trivia Quiz & Fun Facts Collection (1–10)
What part of the human body corresponds to the hole on top of a dolphin’s head?
- nose
- ear
- mouth
See the answer
nose
The hole on top of a dolphin’s head is called a blowhole, and it’s the organ they use to breathe. It’s equivalent to a human nose, connected to the lungs, and when they surface, they breathe through it.
Which sea has the highest salinity?
- the Baltic Sea
- Red Sea
- the Dead Sea
See the answer
the Dead Sea
The Dead Sea is located between Jordan and Israel and is famous for its exceptionally high salinity—over about 30%—one of the highest among the world’s seas and lakes. Incidentally, despite having “sea” in its name, it is actually a lake.
What does the term “shiome” (the boundary of ocean currents) mean?
- a place where the depth of the sea changes suddenly
- A place where seawater from different currents collides
- where the tide comes in
See the answer
A place where seawater from different currents collides
A tidal rip (shiome) is the boundary line formed where ocean currents with different temperatures or salinity levels collide. It is known as a place where fish tend to gather.
Trivia quiz and fun facts about the sea you might not know: Questions 11–20
Why do deep-sea fish often have small or degenerated eyes?
- Because very little light reaches the deep sea, eyes aren’t necessary.
- In the deep sea, having large eyes makes you more likely to be spotted by predators.
- Because the water pressure in the deep sea is high, large eyes would be crushed.
See the answer
Because very little light reaches the deep sea, eyes aren’t necessary.
The deep sea is a world of darkness where little sunlight reaches. As a result, many deep-sea fish don’t need to rely on vision; in fact, to conserve energy, their eyes are often small or have degenerated.
What is the reason why sardine scales come off easily?
- To protect oneself
- Reduce drag to swim faster
- to make it easier to escape from predators
See the answer
to make it easier to escape from predators
The fact that sardine scales come off easily serves as a defense mechanism: when caught by a predator, the fish can slip away, leaving only its scales behind. This makes it easier for them to escape even if they are seized by an enemy.
How do whales breathe underwater?
- breathing through gills
- Taking in oxygen from the water through the mouth.
- Breathing through the nose using the lungs
See the answer
Breathing through the nose using the lungs
Unlike fish, whales are mammals, so they breathe with lungs just like land animals. When they are in the water, they hold their breath while swimming, and to breathe they surface and inhale and exhale through the blowhole on top of their heads.
When you think of seabream, you might picture a red color, but there are also black seabream with dark bodies. So, why do black seabream turn black?
- Because their body color changes to match the color of their food
- Because it’s nocturnal and blends into the darkness
- To adapt to environments such as mud and rocky terrain
See the answer
To adapt to environments such as mud and rocky terrain
Black sea bream are thought to have evolved dark bodies to protect themselves from predators because they inhabit environments such as rivers and coastal mudflats and rocky areas. Their defining characteristic is their black body color.