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WorksheetsOcean Chemistry Quiz
Total questions: 15
Worksheet time: 5mins
What is the most common salt in ocean water?
Magnesium chloride
Calcium sulfate
Sodium chloride
Potassium nitrate
What term describes the total amount of dissolved salts in water?
Density
Salinity
Buoyancy
Pressure
What is the average salinity of ocean water?
25 parts per thousand
35 parts per thousand
45 parts per thousand
55 parts per thousand
Which factor decreases ocean salinity?
High evaporation
Freezing of ocean water
Large river discharge
Hot, dry climate
Where is ocean salinity typically higher?
Near the mouths of rivers
In polar regions where ice melts
In hot, dry climates
In areas with frequent rainfall
How does ocean water compare to fresh water?
It freezes at a higher temperature.
It is less dense.
It has greater buoyancy.
It holds less dissolved gases.
Why does ocean water have more buoyancy than fresh water?
It contains more dissolved oxygen.
It has a lower temperature.
It has a higher density.
It contains less dissolved salts.
Which gases are necessary for marine life and are found in ocean water?
Nitrogen and helium
Oxygen and carbon dioxide
Hydrogen and argon
Methane and ozone
Where is oxygen most plentiful in the ocean?
Near the ocean floor
Near the surface
In deep-sea trenches
In warm tropical waters
What happens to the temperature of ocean water as you move away from the equator?
It remains constant
It becomes warmer
It becomes colder
It fluctuates randomly
Why is there more dissolved oxygen in polar waters than in tropical waters?
Cold water holds more oxygen than warm water.
More algae grow in polar regions.
The ocean surface absorbs less sunlight near the poles.
Evaporation is higher in polar regions.
What is the "water column"?
A measure of ocean salinity
The vertical section of ocean water from surface to floor
A unit of pressure measurement
A type of underwater plant life
What happens to the temperature as you descend through the water column?
It increases steadily.
It decreases.
It stays the same.
It fluctuates randomly.
Why is deep-sea exploration challenging?
High salinity makes it difficult to navigate
Ocean temperatures rise sharply with depth
Water pressure increases significantly with depth
The ocean floor is too smooth for exploration
What is a submersible?
A type of marine plant
A diving technique
A strong underwater vehicle used for deep-sea exploration
A type of ocean current
