1. From the Himalayan rocks
  2. From the Peninsular rocks
  3. Only from the rocks existing locally
  4. From material brought by the rivers
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1 Answers

Answer: Option 3

The soils of the plains have not been derived only from the rocks existing locally. Plains are associated with high productivity due to the generally reliable summer precipitation, a long growing season, and deep, fertile soils. Productivity is greatest in the eastern region (tallgrass prairie), followed by mixed grass, then shortgrass prairie.

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