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Seawater (Grade 10)

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Salinity is a constant factor of seawater that does not change from one place to another in the same ocean.
  1. True
  2. False
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
The amount of dissolved salts in ocean water is called                .
  1. salinity
  2. turbidity
  3. upwelling
  4. current
The rising of deep cold currents to the ocean surface is called
  1. surfing.
  2. mapping.
  3. reefing.
  4. upwelling.
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
Which ocean movement is slow-moving and occurs in deep waters?
  1. surface currents
  2. upwelling
  3. density currents
  4. waves
The most common substance dissolved in seawater is                    .
  1. magnesium sulfate
  2. sodium chloride
  3. sodium nitrate
  4. uranium hexafluoride
Which process does NOT add salt to seawater?
  1. weathering of continental rock washed to the ocean by rivers and streams
  2. decay of hard-shelled sea creatures
  3. rain
  4. volcanoes
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
In some countries, people are interested in taking the salt out of the seawater. Why do you think this is so?

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