8 EW 3-3 Ocean Water Chemistry

1) Salinity is a measure of which of the following in water?

• carbon dioxide
• oxygen
• dissolved salts
• sand

2) What is the most abundant salt in sea water?

• sodium chloride
• magnesium chloride
• calcium chloride
• potassium chloride

3) Which of the following areas in the ocean is likely to have the lowest salinity?

• a warm, tropical sea
• the cold Arctic Ocean
• a bay at the mouth of a big river
• deep parts of the Pacific Ocean

5) Which of these gases is about 60 times more plentiful in the ocean than it is in the atmosphere?

• oxygen
• carbon dioxide
• carbon monoxide
• helium

6) The densest ocean water is generally found

• in the surface zone.
• in the transition zone.
• in the deep zone.
• along the coast.

7) The growth of algae in ocean water is limited by their need for

• warm ocean currents.
• carbon dioxide and sunlight.
• dissolved oxygen.
• low salinity.

8) In which zone is ocean temperature most affected by the weather?

• transition zone
• deep zone
• surface zone
• polar zone

9) As you descend through the water column,

• temperature decreases.
• pressure decreases.
• light increases.
• density decreases.