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GS Geography Physical Geography of World
Q.

The salt concentration (measured as salinity in parts per thousand), is less than % in inland waters.
Explanation:

ANS. (A) 
Salinity is the measure of all the salts dissolved in water. Salinity is usually measured in parts per thousand (ppt or %). The average ocean salinity is 35ppt and the average river water salinity is 0.5ppt or less.

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