Little boy, surnamed Xu, is a native of Orthography. Please help immortals from all walks of life to name him. Preferably Xú Zhēng. thank you

Earth is one of the five elements, but it is the most important "one". The restraint of the other five elements can not be separated from earth-all human production and life take place on land.

Soil can produce gold, and metal ores are dug out of the soil.

But as the saying goes, "clear water means no fish", and heavy soil means no gold. The reason is that the soil is too heavy and pure, and there are no impurities in the soil. How is gold produced?