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Seawater Properties (Grade 9)

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Seawater Properties

1. 
Salinity is a constant factor of seawater that does not change from one place to another in the same ocean.
  1. True
  2. False
 
2. 
The temperature of seawater varies by latitude; the lower the latitude the lower the temperature, the higher the latitude the higher the temperature.
  1. True
  2. False
3. 
What percentage of ocean water is made up of salts?
  1. 3.5%
  2. 35%
  3. 5%
  4. 10%
 
4. 
Which type of seawater has the greatest density?
  1. warm, with low salinity
  2. warm, with high salinity
  3. cold, with low salinity
  4. cold, with high salinity
5. 
What evidence indicates that the salt content of ancient oceans was about the same as it is today?
  1. seafloor sediments
  2. comparisons of modern seashells and old fossil shells
  3. ancient lava flows that formed in seawater
  4. salt content in surface water versus the salt content in bottom water
 
6. 
Higher salinity                      vapor pressure and                      evaporation rate.
  1. decreases, decreases
  2. decreases, increases
  3. increases, increases
  4. increases, decreases
7. 
The principal nutrients of ocean water are
  1. sodium and chloride
  2. lead, mercury, and manganese
  3. phosphorus, nitrogen, and silicon
  4. carbon dioxide, oxygen, and hydrogen
 
8. 
An increase in which of the following would most likely decrease the concentration of gases in seawater?
  1. salinity
  2. pressure
  3. wind speed
  4. wave turbulence
9. 
Explain why the oceans are salty and most lakes are not salty.






 
10. 
Why is ocean water more dense near the North and South Poles?






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