loamy soil
The things that absorb light are leaf litter and similar organic stuff. that means that there is more chance that light can be absorbed by organic dominated soil rather than rock or sand. If you remember that soil itself is a combination of rock and organic matter it is easier to remember the answer to your question.
Is it By Spain
alluvial soil is the most reproductive soil
Britain
Most of the middle Himalayan hills are dominated by narrow leaf conifers, mosses and ferns.
The soil composition in the taiga is typically acidic and nutrient-poor due to slow decomposition of organic matter in the cold climate. It is dominated by a layer of organic material (peat) on top of mineral soil. The soil tends to be shallow and frozen for much of the year, limiting plant root development.
In the wettest climate, soil development is dominated by leaching and podzolization processes, leading to the formation of podzols. In the driest climate, soil development is limited, leading to the formation of aridisols characterized by low organic matter content and distinct horizon development.
The topsoil layer contains the most fertile soil. It is the upper layer of soil that is rich in organic matter, nutrients, and microorganisms, making it ideal for plant growth.
Eastern Europe
agriculture
Alaska has the most diverse soil types in North America containing 7 of the 12 soil types. The most common to be found is Tanana soil.
alluvial soil covers the most part of India.