About this Study Set
This study set covers Oceanography through
18 practice questions.
An exploration of physical, chemical, and biological oceanographic principles. Every question includes the correct answer so you can learn as you go — pick any format above to get started.
Questions & Answers
Browse all 18 questions from the
Foundations of Oceanography study set below.
Each question shows the correct answer — select a study format above to practice interactively.
1
Which layer of the ocean is defined as the transition zone where temperature decreases rapidly with increasing depth?
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A
Mixed layer
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B
Thermocline
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C
Halocline
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D
Abyssal zone
2
What is the primary force responsible for generating the majority of surface ocean currents?
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A
Coriolis effect
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B
Tidal forces
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C
Wind
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D
Density gradients
3
Which chemical compound is the most abundant dissolved salt in seawater?
-
A
Magnesium sulfate
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B
Calcium carbonate
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C
Potassium chloride
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D
Sodium chloride
4
What is the average salinity of the world's oceans in parts per thousand (ppt)?
5
The 'Great Ocean Conveyor Belt' is formally known as what type of circulation?
-
A
Surface wind circulation
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B
Thermohaline circulation
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C
Tidal resonance
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D
Eddy diffusion
6
Which geological feature is formed at a divergent plate boundary where new oceanic crust is created?
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A
Deep-sea trench
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B
Mid-ocean ridge
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C
Continental shelf
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D
Volcanic island arc
7
What is the name of the phenomenon where cold, nutrient-rich water rises from the depths to the surface?
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A
Downwelling
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B
Upwelling
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C
Convergence
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D
Turbidity
8
Which zone of the ocean, also known as the twilight zone, receives faint sunlight but not enough for photosynthesis?
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A
Euphotic zone
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B
Disphotic zone
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C
Aphotic zone
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D
Bathyal zone
9
What is the primary cause of ocean tides on Earth?
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A
Atmospheric pressure variations
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B
Gravitational pull of the Moon and Sun
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C
Undersea volcanic activity
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D
Density differences in water
10
Which of these is the deepest trench in the world's oceans?
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A
Tonga Trench
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B
Philippine Trench
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C
Mariana Trench
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D
Kermadec Trench
11
What defines the 'benthic zone' in an ocean ecosystem?
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A
The pelagic water column
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B
The surface waves
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C
The ocean floor
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D
The intertidal spray zone
12
Which element, essential for biological life, is most often the limiting nutrient in marine ecosystems?
-
A
Oxygen
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B
Nitrogen
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C
Sodium
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D
Chlorine
13
What is the effect called where moving objects, such as ocean currents, are deflected to the right in the Northern Hemisphere?
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A
Ekman spiral
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B
Coriolis effect
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C
Geostrophic flow
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D
Langmuir circulation
14
How does increasing the pressure in the deep ocean affect the solubility of gases in seawater?
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A
It decreases solubility
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B
It increases solubility
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C
It has no effect
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D
It converts gas to solid
15
What is the term for the total mass of living organisms in a given area or volume?
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A
Ecosystem
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B
Biomass
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C
Population density
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D
Trophic level
16
Which type of sediment is formed by the precipitation of minerals directly from seawater?
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A
Lithogenous
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B
Biogenous
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C
Hydrogenous
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D
Cosmogenous
17
What is the average depth of the world's oceans?
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A
Approximately 1,000 meters
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B
Approximately 3,700 meters
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C
Approximately 7,500 meters
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D
Approximately 10,000 meters
18
Which process involves the movement of water molecules through a semi-permeable membrane, crucial for regulating marine organism salt balance?
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A
Osmosis
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B
Diffusion
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C
Active transport
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D
Capillary action
