Think about the origin of the fertile land, you can't help but have a feeling of remote generations. The planet we lived in was the lonely big stone ball without the layer of soil in the oldest times. The power of the solar wind and rain, and the bodies of primitive creatures, have created layers of soil for the earth. Every millennium and thousands of years, the soil adds a thin layer. Think of our North China loess with a thickness of 50 meters Plateau! How long should that be a masterpiece of nature! Which of the following options is incorrectly understood? ['The formation of fertile land has been amazing for a long time.', 'The soil on the Loess Plateau in North China is up to 50 meters thick. It is a masterpiece of nature.', 'With the power of the solar wind and rain plus the corpse of the primitive creatures, it took many billions of years to create layers of soil for the earth.', 'The planet we inhabited was a lonely large stone with rare signs of life in the oldest times.']