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Oceans and salt water

 
Question:  We have several questions which relate to oceans. 1) Why can't humans 
drink salt water?  2) Why are the oceans made of salt water?  3) Do all the oceans 
contain the same level of salt water?
WallyB

Answer:  Humans can't drink salt water because the kidneys can only make urine that 
is less salty than salt water.  Therefore, to get rid of all the excess salt taken in 
by drinking salt water, you have to urinate more water than you drank, so you die of 
dehydration.  All parts of all oceans are not the same, a lot of this because of fresh 
water runoff from streams. -ProfBill

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