Of the following statements about seawater salinity, which is/are true?

-An increase in salinity causes a corresponding decrease in electrical conductivity.
-The two most common dissolved components in seawater are sodium and chloride.
-Seawater salinity averages 35‰.
-Seawater salinity averages 3.5%.
-Seawater salinity does not vary from place to place in the ocean.


-The two most common dissolved components in seawater are sodium and chloride.
-Seawater salinity averages 35‰.
-Seawater salinity averages 3.5%.`

Environmental & Atmospheric Sciences

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a. True b. False

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A 10-kg block with an initial velocity of 10 m/s slides 10 m across a horizontal surface and comes to rest. It takes the block 2 s to stop. The stopping force acting on the block is about

A) 5 N. B) 10 N. C) 25 N. D) 50 N. E) none of the above

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Using standard time zones, if a country is 60 degrees to the east of you, theoretically, it would be:

A) four hours behind you B) four hours ahead of you C) three hours ahead of you D) three hours behind you E) the same time as your location

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Which of the following is the most abundant long-lived greenhouse gas in our atmosphere?

A) Methane B) Water vapor C) Nitrous oxide D) Carbon dioxide

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