What must happen to a sedimentary rock in order for it to change into an igneous rock? ?

The sedimentary rock would include melting and cooling in order for it to change it into an igneous rock.

It must undergo extreme volcanic heat or molten heat to break down and melt its sediments to reform an igneous rock.  

Nigeria and south africa

Africans learned what the europeans wanted them to learn. instead of learning about african history and current information that could and would them they learned solely what europe wanted them to. and not everyone received the same education, some received better and others none.