It depends on what you are trying to say. Are you trying to say that mankind's survival depends on the soil? 1. From soil comes food; from food comes survival. Therefore, mankind depends on agriculture for his very survival. 2. Man needs soil to produce food, so our lives ultimately depend on agriculture using fertile soil to produce food. 3. Mankind's survival, fertile soil, food, and agriculture are all inextricably intertwined. 4. From soil to food to survival. Agriculture is vital to man's existence. 5. Agriculture uses soil to produce food, which is vital for man's existence.