Why would you not find soils on mars or venus?

Soil does not exist on these two planets simply because not all materials that compose it exist there, such as water and the presence of organic materials. Water is one of the materials, along with presence of air and rocks in order for soil to be created. read more

Soil is the unconsolidated mineral and organic material on the immediate surface of the earth that serves as a natural medium for the growth of land plants. Downer soils are used mostly as woodland. The natural vegetation consists of mixed oaks, hickory, and scattered pines. read more