Assertion A: Datum plane is difficult to determine.
Reason R: Sea level is not the same always and everywhere; it fluctuates.
In the light of the above statements, choose the most appropriate answer from the options given below
Assertion A & Reason R Analysis: Datum Plane and Sea Level
This section analyzes Assertion A and Reason R concerning the difficulty in determining a datum plane and the nature of sea level.
Analyzing Assertion A: Datum Plane Difficulty
Assertion A states that a datum plane is difficult to determine. A datum plane serves as a reference point for elevations and depths in various fields like surveying, engineering, and navigation. Establishing a precise and stable datum plane is indeed challenging due to several geophysical and practical factors. Thus, Assertion A is considered correct.
Analyzing Reason R: Sea Level Fluctuations
Reason R states that sea level is not constant; it fluctuates. This is factually correct. Sea levels are influenced by factors such as tides, atmospheric pressure, wind, ocean currents, and geological processes. These fluctuations mean that the sea surface is not a fixed or stable reference point globally or even locally over time. Thus, Reason R is correct.
Evaluating the Explanation
Reason R directly addresses a key challenge in establishing a reliable datum plane. Because sea level fluctuates (Reason R), it cannot consistently serve as a stable reference. This inherent variability of the sea surface makes it difficult to define and maintain a precise datum plane, especially when it is referenced to mean sea level. Therefore, the fluctuating nature of sea level is a primary reason for the difficulty in determining a datum plane.
Conclusion: Both Assertion A and Reason R are correct, and Reason R provides the correct explanation for Assertion A.
Choosing the Correct Option
Based on the analysis:
- Assertion A is correct.
- Reason R is correct.
- Reason R correctly explains why Assertion A is correct.
This corresponds to Option 1.
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Which one of the following is not a cold current?
Which of the following positions of Sun, Earth and Moon is/are suitable for Spring Tide?
1. SYZYGY Conjunction
2. SYZYGY Opposition
3. Quadrature
Select the correct answer using the code given below :
The maximum depth of Lithosphere is found in the
The periodic rise and fall of ocean water in response to gravitational forces is called
Consider the following statements regarding 'fronts':
1. The movement of a front causes a slow change in weather in the area over which it moves.
2. Cold fronts are associated with thunderstorms.
3. Warm front is the boundary between an advancing mass of warm air where it is overriding and rising above a mass of colder air.
Which of the statements given above is/are correct?
