Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: The change in sea level at any coastal location depends on the sum of global, regional and local factors.
Reason R: Therefore, the global mean sea level rise translates into an uniform rise in sea level around the world
In the light of the above statements, choose the most appropriate answer from the options given below.
Correct Answer :
A is correct but R is not correct
Solution :
The correct answer is A is correct but R is not correct.
Step-by-Step Explanation:
1. Analysis of Assertion A:
Assertion A states: "The change in sea level at any coastal location depends on the sum of global, regional and local factors."
This statement is scientifically accurate. Sea level change at a specific coastal location is not determined by a single global value. Instead, it is the net result of:
- Global factors: such as thermal expansion of the oceans due to warming and the melting of land-based ice sheets and glaciers.
- Regional factors: such as ocean circulation patterns, changes in wind fields, and gravitational adjustments resulting from ice mass redistribution.
- Local factors: such as land subsidence (sinking) or tectonic uplift, compaction of sediment, and local human activities like groundwater extraction.
Therefore, Assertion A is correct.
2. Analysis of Reason R:
Reason R states: "Therefore, the global mean sea level rise translates into an uniform rise in sea level around the world."
This statement is incorrect. Because of the regional and local factors explained above (e.g., changes in ocean currents, Earth's gravity field, and vertical land movement), sea level rise is highly non-uniform. Some coastal regions experience sea level rise at a rate much higher than the global average, while others may even experience a relative drop in sea level. Thus, the global mean sea level rise does not translate into a uniform rise around the world.
Therefore, Reason R is not correct.
Conclusion:
Since Assertion A is correct and Reason R is incorrect, the most appropriate option is "A is correct but R is not correct".
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