Ocean Chemistry

What do we call the amount of dissolved salts in a sample of ocean water?

• salt

• salty water

• salinity

• calcium

Where does the salt come from? Choose TWO

• Kroger

• volcanic eruptions

• lamps

• dissolved rock

What is the average salinity of the ocean?

• 3%

• 3.5%

• 4%

• 4.5%

What is the most abundant salt in the ocean?

• sodium

• sodium chloride (NaCl)

• calcium chloride (CaCl2)

• chlorine

What does the word buoyancy mean?

• the ability to sink

• the ability to float

• density

• salinity

Select two reasons as to why salinity can INCREASE

• Evaporation because water is changing into water vapor leaving salt behind.

• Freshwater is added to ocean at the mouths of large rivers as they empty freshwater into oceans.

• Freshwater is added by rain, snow, and melting ice.

• Surface water freezes into ice, leaving salt behind.

Select two reasons as to why salinity can DECREASE

• Evaporation because water is changing into water vapor leaving salt behind.

• Freshwater is added to ocean at the mouths of large rivers as they empty freshwater into oceans.

• Freshwater is added by rain, snow, and melting ice.

• Surface water freezes into ice, leaving salt behind.

How does salt affect ocean water?

• lowers freezing point

• raises freezing point

• increase density giving ocean water a greater buoyancy

• decreasing density giving ocean water a lower buoyancy

Near the equator water is

• cold

• warm

Tags

NGSS.MS-ESS2-6

Near the poles water is

• cold

• warm