What is Soil ? 1. Soil is not dirt 2. Soil is not inert 3. Soil is in a dynamic state 4. Soil is a three-dimensional body 5. Soil is a three-phase system What is SOIL Definition: “A dynamic natural body on the surface of the earth in which plants grow, composed of mineral & organic materials and living form“ Soil is a product of the interaction of water, air, and living organisms with exposed rocks or sediments at the Earth‘s surface Soil contains : 45% inorganic materials 5% organic materials 25% air 25% water