PDE Q16
- A
About 97.5 per cent of the total volume of water available on the earth is salty
- B
80 per cent of the water available to us for use comes in bursts as monsoons
- C
About 2.5 per cent of the total water available on the earth is polluted water and cannot be used for human activities
- D
Possibility is that some big glaciers will melt in the coming ten-fifteen years and sea level will rise by 3-4 meters all over the earth
- Option : C
- Explanation :
A. About 97.5 per cent of the total volume of water available on the earth is salty
True — Around 97.5% of Earth’s water is in oceans and seas and is saline, leaving very little as freshwater.B. 80 per cent of the water available to us for use comes in bursts as monsoons
True — A large proportion of usable freshwater in India (and many tropical areas) arrives seasonally during monsoons.C. About 2.5 per cent of the total water available on the earth is polluted water and cannot be used for human activities
Not true — About 2.5% of total water is freshwater, not polluted water. Though freshwater resources can be polluted, the 2.5% refers to freshwater available in glaciers, groundwater, etc.D. Possibility is that some big glaciers will melt in the coming ten-fifteen years and sea level will rise by 3-4 meters all over the earth
Broadly true in terms of glacier melting, but exaggerated on sea level rise; scientists project sea level to rise by a few centimeters to around a meter by the end of the century, not 3–4 meters in just 10–15 years.Answer: C is not true.
