Free quiz · 8 questions · Warm-up to Boss
The ocean quiz
How well do you really know The ocean? These 8 questions start easy and end with a Boss round. There are no multiple choice options: you type what you know, and every answer is checked against the key facts.
60 seconds a question, one 2x boost, and a leaderboard. Playing with friends writes a fresh set of The ocean questions for your group.
The questions
- Warm-up
What is Earth's connected saltwater expanse called, and roughly what share of the planet's surface does it cover?
Show the answer
- It is the ocean.
- It covers about 71% of Earth's surface.
- Easy
Which ocean spans the greatest area, and name two continents along its shores.
Show the answer
- Pacific Ocean
- Asia
- Australia
- North or South America, or Antarctica
- Easy
Which celestial body has the biggest effect on ocean tides, and what does its gravity do to ocean water?
Show the answer
- The Moon has the biggest effect
- Its gravity pulls ocean water into tidal bulges
- The Sun also affects tides
- Easy
What gives ocean water its salty taste, and how do those substances get into the sea?
Show the answer
- Dissolved salts and minerals make ocean water salty.
- Rivers carry dissolved minerals from weathered rocks into the sea.
- Underwater volcanic activity also adds minerals.
- Easy
What does a submarine send out with sonar, and how does the returning echo help locate an underwater object?
Show the answer
- A sound pulse or ping
- The object reflects the sound
- The echo’s return time helps estimate the object’s distance
- Medium
Which ocean current carries warm water north toward Western Europe, and what effect does it have on the region’s climate?
Show the answer
- The Gulf Stream, with its continuation the North Atlantic Drift, carries warm water north.
- It helps keep Western Europe milder than it would otherwise be.
- Medium
At a deep-sea hydrothermal vent, what heats the water, and how does seawater get down to that heat source?
Show the answer
- Heat from hot rocks or magma beneath the seafloor
- Seawater circulates down through cracks in the ocean crust
- Heated water rises back through the seafloor at the vent
- Boss
At Challenger Deep, roughly how deep is the seafloor, and about how many times sea-level pressure would a person face there?
Show the answer
- About 10,900 metres deep
- About 36,000 feet deep
- Pressure is roughly 1,100 times sea-level pressure
How scoring works
- Each question has 2 or 3 key facts. Each one earns full, half or no credit, so a wrong answer scores zero.
- Later questions are worth more, fast answers earn a bonus, and great answers in a row build a streak.
- A famous myth or a clear factual error halves the points.
More quizzes
- Space quiz
- The solar system quiz
- The human body quiz
- Dinosaurs quiz
- Animals quiz
- Sharks quiz
- Volcanoes quiz
- Chemistry quiz
- Inventions quiz
- ISRO and Indian space missions quiz
- Famous scientists quiz
- The seven wonders of the world quiz
Or pick any topic you like and play it with friends.