Metal roof provides increased wind resistance when compared to other roofing materials. This is because metal roofing systems use interlocking panels. The disadvantages of metal roofs include the noise created from rain hitting the roof, and, in snowy areas, the tendency of snow to easily fall off the roof and onto pedestrians or property. Originally, metal roofs were made of corrugated galvanized steel: a wrought iron–steel sheet was coated with zinc and then roll-formed into corrugated sheets. Another approach is to blend zinc, aluminum, and silicon-coated steel. These products are sold under various trade names like "Zincalume" or "Galvalume". The surface may
Anarchy Is What States Make of It Anarchy Is What States Make of It "Anarchy Is What States Make of It: The Social Construction of Power Politics" is a journal article by Alexander Wendt published in "International Organization" in 1992 that outlines a constructivist approach to international relations theory. Wendt argues that anarchy is not inherent in the international system in the way in which other schools of international relations theory envision it, but rather it is a construct of the nation-states in the system. At the core of constructivist thought is the idea that many core aspects of international relations are socially constructed (they are given