Question

Which of the following statements is true?
The ocean contains very little NaCl.
Dissolved minerals from rocks are deposited in the ocean.
Density is a comparison between volume and salinity.
One atmosphere is equal to 20 pounds per square inch (psi).

Answer 1

I'm not sure, but I think its the last or the second last one. Sorry I couldn't be of much use.

Answer 2

No. 2) Dissolved minerals from rocks are deposited in the ocean.

Answer 3

the first one is incorrect.
the second is correct but phrased awkwardly ( http://www.discoverymagazine.com/digger/d97dd/d9704dd.html)
third is false
and it can vary but generally around fifteen