RAS question
The Dead Sea is an example of which type of water body?
Correct answer: (A) Hypersaline lake.
The Dead Sea is a hypersaline lake, not a sea in the oceanographic sense.
Explanation
The Dead Sea is best classified as a hypersaline lake because the key feature is its exceptionally high salt concentration, about 34%. Journal of Paleolimnology (Springer Nature Link) treats the Dead Sea as a lake-water body and discusses its salinity increase, salt precipitation, thermohaline structure and lake-level changes, which fits the idea of a closed, highly saline lake rather than a marine sea. This extreme salinity is also why the name is associated with the near-absence of macroscopic life. For RAS preparation, the same concept connects global examples with Rajasthan geography: Sambhar Lake is India's largest inland saline lake.
Why the other options are wrong
- (B) A coral reef lagoon is a shallow water body associated with reefs, while the Dead Sea is described here as a hypersaline lake with salt and lake-level dynamics, not a reef lagoon.
- (C) A river estuary is a transition zone where a river meets the sea, whereas the Dead Sea is a lake-water body.
- (D) A freshwater lake cannot describe the Dead Sea because its salinity is about 34%, making it extremely salty.
Concept
This tests the physical-geography classification of water bodies, especially saline and hypersaline lakes. It recurs in RAS because Rajasthan geography often links local saline lakes such as Sambhar with standard global examples.