Ocean Water - Chapter 20.

Which factor does not affect the salinity of ocean water?

• precipitation
• dissolved gasses
• temperature
• evaporation

What of the following is most responsible for the tides on Earth?

• gravity
• winds
• temperature differences in seawater
• plate tectonics

What is the primary cause of surface currents in the ocean?

• gravity
• density differences in ocean water
• temperature differences in water
•   winds

Tides occur because of

• the pull of gravity between two bodies
• the blowing of wind across the oceans
• the friction generated by waves moving along coastlines
• the diffences in temperature throughout the oceans

What is the relationship between dissolved gases and water temperature?

• As temperature increases, ocean water can hold more dissolved gases.
• As temperature decreases, ocean water can hold more dissolved gases.
• As gas content increases, temperature decreases.
• As gas content decreases, temperature decreases.

What is the primary cause of deep currents in the ocean?

• the Coriolis effect
• winds
• density differences in ocean water
• upwellings

How is the density of ocean water calculated?

• volume/mass
• salinity/volume
• mass/volume
• salinity/mass

What is the relationship between oxygen in water and plankton abundance?

• As oxygen levels increase, plankton populations increase.
• As oxygen levels increase, plankton populations decrease.
• As oxygen levels increase, phytoplankton populations increase but zooplankton populations decrease.
• There is no relation between plankton abundance and oxygen content.

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NGSS.MS-LS2-4

The water in upwellings is

• cold
• nutrient-rich
• oxygen rich
• all of the above

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What is one of the most common materials dissolved in ocean water?

• calcite
• gypsum
• salt
• basalt