Ocean Chemistry Quiz

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

Tags

NGSS.MS-LS1-6

Where is oxygen most plentiful in the ocean?

• Near the ocean floor

• Near the surface

• In deep-sea trenches

• In warm tropical waters

Tags

NGSS.MS-LS1-6

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

Tags

NGSS.MS-ESS2-6