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Oceanography and Marine Life Facts

Oceanography

A collection of factual questions covering marine biology, ocean chemistry, and physical oceanography.

science marine-life ocean

8 Questions Medium Ages 5+ Oct 23, 2026

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About this Study Set

This study set covers Oceanography through 8 practice questions. A collection of factual questions covering marine biology, ocean chemistry, and physical oceanography. Every question includes the correct answer so you can learn as you go — pick any format above to get started.

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1 Which layer of the ocean, also known as the twilight zone, receives only faint, filtered sunlight?

A Epipelagic zone
B Mesopelagic zone
C Bathypelagic zone
D Abyssopelagic zone

2 What is the primary substance that makes up the skeletal structures of most reef-building corals?

A Calcium carbonate
B Silica
C Magnesium sulfate
D Iron oxide

3 Which marine mammal is known to have the densest fur of any animal, used for insulation in cold water?

A Bottlenose dolphin
B Walrus
C Sea otter
D Weddell seal

4 What is the deepest known point in the Earth's oceans?

A Puerto Rico Trench
B Java Trench
C Mariana Trench
D Tonga Trench

5 Which phenomenon is primarily responsible for the circulation of deep ocean currents globally?

A Thermohaline circulation
B Coriolis effect
C Lunar gravity
D Trade winds

6 What is the primary food source for baleen whales like the blue whale?

A Small fish
B Squid
C Krill
D Seaweed

7 Approximately what percentage of the Earth's surface is covered by oceans?

A 51%
B 71%
C 81%
D 91%

8 Which ocean feature is formed by the tectonic process of seafloor spreading?

A Mid-ocean ridge
B Continental shelf
C Guyot
D Atoll

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