Actually there is a book with that title. I saw it last week at Books-a-Million.
Rich soil would be high in organic matter. Soil organic matter is the biologically active portion that drives the soil ecosystem and releases nutrients necessary for
plant growth. Simply stating, rich soil is very fertile soil. Adding manure and compost to the soil is a good way to increase the organic matter.
Sandy loam has a soil texture that feels gritty. An example of sandy loam would consist of 60% sand, 15% clay, and 25% silt. Sandy soils feel gritty, clay feels sticky when wet, and silty soils are powdery when dry.