In southern Africa, there is a large lake with an area of ​​nearly 30,000 square kilometers. The lake is vast and the scenery is beautiful. However, it is unbelievable that sometimes there will be a top-shaped smoke column hundreds of meters high on the lake. Mysterious and weird. 　　A big smoky lake 　　 This smoky big lake is called Lake Malawi, which is located at the junction of Malawi, Mozambique and Tanzania in southern Africa. The locals also call it Lake Nyasa, which means “big water” or lakes”. The water here is clear and clear. On a windless day in September, the transparency of the lake can reach 20…