Final answer:
The soil type described, characterized by high organic content and commonly found in wetlands, is Histosols, which is formed through complex biological, physical, and chemical processes.
Step-by-step explanation:
The question is about soil types, specifically soils that are composed mainly of organic materials, contain at least 20-30% organic matter, have a low bulk density of less than 0.3 G/cc, and form in wetland settings. These characteristics describe Histosols, which are soils largely composed of organic material and typically found in areas such as swamps and bogs. Soil formation is affected by biological, physical, and chemical processes that work on both mineral and organic components, leading to various soil types with specific features suited for different environmental conditions.