Africa, as the world's second largest continent, is rich in land resources. With few rugged mountains and hilly area but much flat plateau, the size of arable land in Africa ranks first among all continents. Most of the region has good conditions for developing agriculture. Because Africa is located in the tropical and subtropical zone and rich in heat, crops can be reaped two or three times a year. In addition, Africa's surface water resources accounts for 12% of the world, which provided water protection ...