Question 1 of 5
Which ocean layer receives enough sunlight for most photosynthesis?
Answer & explanation
The upper sunlight zone
The upper euphotic zone receives enough light for photosynthetic producers.
5 questions · Untimed · Free
Ocean Quiz
What changes as you descend below the waves? Explore sunlight, pressure, salinity, surface currents and the way kelp stays attached to rock. Five questions, including one illustrated example, introduce ideas from Oceans & Marine Systems.
This five-question sample is free. The full downloadable topic is included with optional Arca Curiosa Plus.
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Question 2 of 5
As a sensor descends in the ocean, what happens to water pressure?
Answer & explanation
It increases
The weight of overlying water increases pressure with depth.
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Question 3 of 5
What does seawater salinity describe?
Answer & explanation
The concentration of dissolved salts
Salinity is the concentration of dissolved salts; it can vary with precipitation, evaporation, and other local conditions.
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Question 4 of 5
What drives much of the ocean’s surface circulation?
Answer & explanation
Wind dragging on surface water
Global winds exert drag on surface water and help set surface currents in motion.
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Question 5 of 5
A kelp holdfast grips a rocky seafloor. What is its main function?
Answer & explanation
Anchor the kelp to the rock
The holdfast attaches kelp to its rocky substrate, while blades collect sunlight and gas-filled bladders in many species help with buoyancy. These structures have different roles even though kelp can resemble a rooted land plant.
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FROM ANSWERING TO UNDERSTANDING
What you can learn from this quiz
- Sunlight and pressure below the ocean surface
- Salinity and surface currents
- The function of a kelp holdfast
A way to learn more from each answer
Separate a condition in the water from a process that moves it or a structure used by an organism. After each answer, describe what was being measured, moved or supported. The kelp illustration supports the text; you do not need to identify an unlabeled detail to answer.
Read further with a quiz source: NOAA National Ocean Service: How far does light travel in the ocean?Before you move on
Choose a question that surprised you. Explain the answer in your own words and open its source link if you want to explore further. You can try again; the score reflects this short quiz, not your mastery of the whole category.
Read examples and explanations in the learning guide →
Keep exploring: Science & Nature or World & Geography.
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