1. To an agriculturist, soil is the substance existing on the earth's surface, which grows and develops plants
2.To a geologist, soil is the material in a relatively thin surface zone within which roots occur, and rest of the crust is termed as rock irrespective of hardness
3.To an engineer, soil is the unaggregated and uncemented deposits of minerals and organic particles covering the earth's crust
4.All the above.