Oceans & Marine Life

The water covering most of the planet, and what lives in it.

Most of the planet is ocean and most of that ocean is barely explored, which makes it the largest gap in our general knowledge of our own world. This category covers the basins and their scale, the physical processes, tides, salinity, currents, that govern them, and the creatures that live at every depth. It includes coral reefs, which support a disproportionate share of marine life from a tiny share of the seabed. The explanations connect an organism to the conditions it lives in, since almost every marine adaptation answers a problem of pressure, light or temperature.

7 quizzes in Oceans & Marine Life

Hard
Oceans & Marine Life

Life in the Deep Sea

Bioluminescence, vent communities and the slow economy of a world without sunlight.

Sample question

Which name is given to the ocean layer below roughly 1,000 metres, where sunlight never…

10 questions 7 min Answers explained
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Questions

About Oceans & Marine Life quizzes

How many Oceans & Marine Life quizzes are there?

7 published quizzes in this subject, 70 questions in total. Every one is researched, written and checked by hand.

How hard are they?

The mix here is 2 easy, 3 medium and 2 hard. Difficulty is about how obscure the answers are, not how fast you have to be — there is no timer on any quiz.

How long does one take?

About 7 minutes on average, ranging from 6 to 8. Playing every oceans & marine life quiz would take roughly 1 hour.

Which one should I start with?

"Tides, Depths & Reefs" is the gentlest way in — 10 questions, about 6 minutes, rated easy.

Do I need an account?

No. Every quiz is free and playable straight away. An optional free account only saves your scores across devices.

Do you explain the answers?

Yes — every question has a short explanation of why the right answer is right, shown the moment you answer, whether you got it or not.