Texas Subcategories This category has the following 7 subcategories, out of 7 total. Energy sources by continent (9 C)A Natural resources in Africa (5 C, 11 P) Natural resources in Asia (1 C, 1 P)E Natural resources in Europe (1 C, 1 P)N Natural resources in North America (6 C, 4 P)O Natural resources in Oceania (1 C, 4 P)S Natural resources in South America (1 C)