What is the main basis of the step-like relief of the Deccan Trap?
Answer and explanation
Correct answer: Successive basaltic lava flows
The correct answer is B. The Deccan Trap was built by repeated, extensive eruptions of fluid basaltic lava. Each successive flow spread over large areas and later cooled into a separate basalt layer. Differential weathering and erosion of these nearly horizontal layers produced escarpments and a stair-step or terrace-like relief; the word “trap” is related to a stair-like appearance. Glacial erosion does not explain this vast volcanic plateau, coral reefs form in shallow marine environments, and Ganga alluvium belongs to a river-built plain. Therefore successive basaltic lava flows provide the correct geological basis for the Deccan Trap’s step-like landscape.
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What is the correct answer to this question?
Successive basaltic lava flows
Why is this the correct answer?
The correct answer is B. The Deccan Trap was built by repeated, extensive eruptions of fluid basaltic lava. Each successive flow spread over large areas and later cooled into a separate basalt layer. Differential weathering and erosion of these nearly horizontal layers produced escarpments and a stair-step or terrace-like relief; the word “trap” is related to a stair-like appearance. Glacial erosion does not explain this vast volcanic plateau, coral reefs form in shallow marine environments, and Ganga alluvium belongs to a river-built plain. Therefore successive basaltic lava flows provide the correct geological basis for the Deccan Trap’s step-like landscape.
Which subject and chapter does this question cover?
This is a Class 10 General Knowledge question. Chapter: Indian Geography. Topic: Mountains and Plateaus of India.
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