Question : The salt concentration (measured as salinity in parts per thousand), is less than___% in inland waters.
Option 1: 5
Option 2: 20
Option 3: 50
Option 4: 75
Correct Answer: 5
Solution : The correct answer is 5
Salt concentration in inland or fresh waters is between 0-5% or 0-5 parts per thousand. Due to low salt concentration it is fit for human consumption and agricultural use. Salinity in brackish water is between 5 - 35% and in oceanic water it is more than 35%. Dead sea is the most saline water body on earth with a salinity of about 340 ppt.
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