What is the thermocline?

A layer where temperature drops quickly with depth

A warming of the eastern tropical Pacific

Cooler than normal eastern Pacific waters

What is a marine heatwave?

A long period of unusually warm sea water

What are Argo floats?

Robotic floats measuring ocean temperature and salt

Why do warm oceans strengthen hurricanes?

Warm water fuels them with heat and moisture

Ocean Temperature Quiz: Can You Get 8 Out of 10?

This ocean temperature quiz covers warm and cold surface waters, the thermocline, deep-sea cold, how oceans store heat, marine heatwaves, El Niño and La Niña, coral bleaching and how scientists measure sea temperatures. Ten questions with answers on the warming sea.

Start Ocean Temperature Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Heat
How much of the extra heat from global warming has the ocean absorbed?
Thermocline
What is the thermocline?
Deep
About how cold is most deep ocean water?
Warmest
Which area has some of the warmest ocean surface water?
El Niño
What is El Niño?
La Niña
What is La Niña?
Heatwave
What is a marine heatwave?
Coral
What happens to corals in very warm water?
Argo
What are Argo floats?
Hurricanes
Why do warm oceans strengthen hurricanes?

Explanations: answer key for all 10 questions

Q1: How much of the extra heat from global warming has the ocean absorbed?
Answer: Over 90%
This slows warming on land.
Q2: What is the thermocline?
Answer: A layer where temperature drops quickly with depth
It separates warm and cold water.
Q3: About how cold is most deep ocean water?
Answer: 0 to 4 °C
Cold, dense water sinks.
Q4: Which area has some of the warmest ocean surface water?
Answer: Western Pacific Warm Pool
Temperatures exceed 28 °C.
Q5: What is El Niño?
Answer: A warming of the eastern tropical Pacific
It affects weather worldwide.
Q6: What is La Niña?
Answer: Cooler than normal eastern Pacific waters
It is El Niño's opposite.
Q7: What is a marine heatwave?
Answer: A long period of unusually warm sea water
The 2014-16 Blob hit the Pacific.
Q8: What happens to corals in very warm water?
Answer: They bleach
They expel their algae.
Q9: What are Argo floats?
Answer: Robotic floats measuring ocean temperature and salt
About 4,000 drift worldwide.
Q10: Why do warm oceans strengthen hurricanes?
Answer: Warm water fuels them with heat and moisture
Storms need about 26 °C water.

Ocean Temperature Quiz – The Warming Sea

Ocean temperatures vary from over 30 °C in tropical seas to below 0 °C near the poles. Sunlight warms the surface, while below the thermocline most deep water stays just above freezing.

The ocean is Earth's great heat store, absorbing over 90% of the extra heat trapped by greenhouse gases. This slows warming on land but heats the sea, causing marine heatwaves, coral bleaching and stronger storms.

Natural cycles like El Niño and La Niña shift ocean temperatures across the Pacific and affect weather worldwide. Scientists measure temperatures with satellites, ships, buoys and thousands of robotic Argo floats.

What This Quiz Teaches

This quiz is for students studying ocean temperature.

How warm and cold the sea gets
What the thermocline is
How much heat oceans absorb
What El Niño is
Why warm seas matter

Did You Know?

Water holds far more heat than air.
Warm water expands, raising sea level.
2023 set ocean heat records.
Fish shift toward the poles as seas warm.
Warm water holds less oxygen.