I want to ask a question about oil and coal.

Oil and coal were produced after n years of time and address changes. During this period, the earth's climate has undergone very complicated changes, unlike now. Trees and animals are converted into coal and oil under the catalysis of pressure and time respectively. The distribution pattern you mentioned is not intentionally arranged, but caused by some specific factors. Jiangsu and Zhejiang are not necessarily oil-free, but our current exploration methods are not very high.