Soil is important part of the environment, and it is not remote from our everyday life at all. For the sake of making use of types of soils on the earth, it's important to explore the characteristics, values and weakness of every kind, and that is why the soil testing works. You may have just seen the potting soil at the ceramic shop, and don't know there are more to learn about soil. As the environment problem gets more serious in the constantly developing society, soil erosion is a frequently mentioned phrase nowadays and the loosing of top soil is being taken more seriously. In agriculture, ph of soil is considered often and it directly effects the growth of plants and it also influences the quality of ground water which structures a specific environment circle together with soil. In city construction, the soil mechanics should be the most important knowledge to know and all the stand up buildings owe to it. Various soils under our feet are not just materials with chemical properties, but some substances with power.
