A zinc coating, usually hot-dipped, in which the zinc and steel form a metallurgical bond. The thickness of a hot-dipped coating can be varied from a thin zinc/iron alloy layer to heavy applications suitable for extended outdoor exposure.
Humid subtropical climate. In Africa, the humid subtropical climates are found in two separate areas on the southern hemisphere of the continent. The Cwa climate is found over a large portion of the interior of the Middle and Eastern African regions.
Africa has a proportionately larger area in arid, or desert, climate zones than any continent except Australia. Each of these areas-the Sahara in the north, the Horn in the east, and the Kalahari and Namib deserts in the southwest-has less than 250 mm (less than 10 in) of rainfall annually.way from the equator, to the north and south, the savanna climate zone grades into the drier steppe climate zone. Average annual rainfall varies between 250 and 500 mm (10 and 20 in) and is concentrated in one season.