The soils in the valley areas of Manipur are often:

The correct answer is: Deep.

The soils in the valley areas of Manipur are often deep and fertile. This is due to the fact that the valley areas are located in the foothills of the Himalayas, which are rich in minerals. The soils in the valley areas are also well-drained, which makes them ideal for agriculture.

The other options are incorrect because:

• Shallow soils are not as fertile as deep soils.
• Rocky soils are not suitable for agriculture.
• Highly weathered soils are not as fertile as less weathered soils.