Rich soils make Southeast Asia a productive agricultural region. What makes this soil so fertile?

Rich soil makes Southeast Asia a productive agriculture region. What makes this soil so fertile? Mineral-rich volcanic material that has broken down over the centuries has left rich, fertile soil, making Southeast Asia's islands highly productive agricultural areas. ... They are all mountainous regions.

Population of this city. also, look for information on available public transit, bike-sharing, and other commuting options. use the information you find and write about it promoting alternative transportation