Zambia is a country of upland plateaus of which eighty per cent are forests and grasslands. The Zambezi River borders it to the south. About fifty per cent of people of Zambia live by subsistence farming, which is constantly threatened by drought. The capital city of Zambia is Lusaka, a thriving industrial and business center. The languages of Zambia is Lunda, Tonga, Nyanja, English, Bemba and Lozi. The main exported crop is tobacco. The world's sixth largest producer of copper is Zambia. Copper forms ninety per cent of the country's export. The Zambian currency is called Zambian Kwacha. The largest producer of cobalt. It mines lead zinc and silver. Varieties of tribal groups live in this region with its own beliefs, customs, and languages.