Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Many natural disasters are caused by the volcanic activity occurring in the island arc systems. Reason (R) : The fissure type volcanism causes the erupted lava to spread over wide areas. In the light of the above statements, choose the most appropriate answer from the options given below :
Volcanic Activity and Natural Disasters: Assertion & Reason Explained
Statement Analysis
This question requires evaluating two statements related to volcanic activity and natural disasters.
Analyzing Assertion (A)
Assertion (A) states that many natural disasters are caused by volcanic activity in island arc systems.
- Island arcs, such as the Ring of Fire, are zones of intense tectonic activity where subduction occurs.
- This subduction triggers significant volcanic activity, leading to eruptions.
- These volcanic eruptions, along with associated phenomena like earthquakes and tsunamis, cause numerous natural disasters.
- Therefore, Assertion (A) is correct.
Analyzing Reason (R)
Reason (R) states that fissure type volcanism causes erupted lava to spread over wide areas.
- Fissure eruptions occur when magma erupts from long, linear cracks in the Earth's crust.
- This type of volcanism is characterized by extensive, fluid lava flows that can cover vast landscapes, forming lava plateaus.
- This statement accurately describes the nature of fissure volcanism.
- Therefore, Reason (R) is correct.
Evaluating the Relationship
The question asks if Reason (R) is the correct explanation for Assertion (A).
- While both statements are individually correct, fissure volcanism is not the primary or sole type of volcanic activity responsible for the majority of natural disasters in island arc systems.
- Island arcs are more commonly associated with explosive stratovolcanoes (composite volcanoes) resulting from the melting of the subducting oceanic plate, leading to pyroclastic flows, ashfall, lahars, and tsunamis, which are major disaster-causing events.
- Fissure eruptions are more typical of continental rifts or oceanic hotspots, not the defining volcanism of island arcs.
- Thus, Reason (R) does not correctly explain Assertion (A).
Conclusion
Both Assertion (A) and Reason (R) are correct statements, but Reason (R) does not provide the correct explanation for Assertion (A).
The most appropriate answer is: Both (A) and (R) are correct but (R) is not the correct explanation of (A).
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Important Questions from Mixed Topic (CUET PG)
- Kalpsutra, the illustrated canonical text is from:-
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- Mohandas Karamchand Gandhi launched quit India movement after the failure of:-
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