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Which physical reason creates marshy conditions in the Terai region?

Answer and explanation

Correct answer: Groundwater coming near the surface

The Terai is a wet, marshy belt lying south of the Bhabar region along the Himalayan foothills. In the Bhabar belt, streams carrying coarse pebbles and gravel often disappear underground because the ground is highly porous. Farther south, where the material becomes finer and less permeable, this underground water reappears near or at the surface. The high water table, gentle slope, and poor drainage produce marshy conditions in the Terai.

Therefore, option A is correct: groundwater comes near the surface. Lava deposition, coral breaking, and permanent Himalayan ice do not explain the regional wetland character of the Terai. The most useful comparison is Bhabar and Terai: water sinks into the porous Bhabar, then re-emerges in the Terai, making the latter moist and swampy. This physical transition directly explains the answer.

Related tags

TeraiGroundwaterMarshy-Region

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