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 because the valley areas are formed by the alluvial deposits of the rivers that flow through them. These deposits are rich in nutrients and minerals, which make the soil ideal for agriculture.

The other options are incorrect because:

• Shallow soils are not as fertile as deep soils because they do not have as much time to accumulate nutrients and minerals.
• Rocky soils are not as good for agriculture because they are not as easy to till and do not hold water as well as other types of soil.
• Highly weathered soils are also not as good for agriculture because they have lost many of their nutrients and minerals.