The Independent Power Producer Procurement Programme. The Department of Energy (DoE), National Treasury (NT) and the Development Bank of Southern Africa (DBSA) established the IPPPP Unit for the specific purpose of delivering on the IPP procurement objectives.
Outer core. The outer core of the Earth is a fluid layer about 2,300 km (1,400 mi)[1] thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle. Its outer boundary lies 2,890 km (1,800 mi) beneath Earth's surface.
The Earth has an inner core and an outer core. Scientists think that the inner core is solid and mainly made of iron. Iron is very hard â thatâs why knights used it to make their armour. The outer core is also mostly iron, but this layer is liquid (melted) iron.he crust is the part of the Earth that we walk on. Compared to the other layers, it is quite thin and breakable. You can think of the crust of the Earth as being a bit like the crust of a pie â although this crust is 5â70 km deep depending on whether you are under the ocean or on top of a mountain!