This type of soil is typical of the Deccan trap (Basalt) region spread over northwest Deccan plateauBlack SoilYellow SoilRed SoilMountain Soil

The type of soil that is typical of the Deccan trap (Basalt) region spread over northwest Deccan plateau is Black Soil.

Here's why:

1. The Deccan trap region is known for its volcanic basalt rocks. When these rocks weather down over time, they form a type of soil known as Black Soil or Regur Soil.

2. Black Soil is rich in calcium carbonate, magnesium, potash, and lime. It is well-known for its capacity to hold moisture, and for its fertility.

3. This type of soil is ideal for growing a variety of crops, especially cotton, which is why the Deccan plateau is one of the premier cotton-growing regions in India.

4. The black soil, due to its volcanic origin, contains several minerals which are essential for plant growth.

5. The color of the soil is due to the presence of a small proportion of Iron, Titanium, and other metallic oxides.

So, the answer to your question is Black Soil.