Origin of soil profile
Speaking of soil, people think of the Loess Plateau in the northwest, majestic mountains and loess layers hundreds of meters and thousands of meters thick, which makes people dizzy. It costs a lot of money to build sand here, and it takes a lot of effort to get a stone to pickle vegetables.
About hundreds of millions of years ago, the earth was full of bare rocks. Due to long-term cold, dry, wet, cold, hot and wind, under the friction of wind, water and sand, rock cracks collapse and the whole rock gradually breaks. This process is called weathering.