In the Late Classic Period Yaxchilan was one of the most powerful Maya cities along the course of the Usumacinta, with Piedras Negras as its major rival. Architectural styles in subordinate sites in the Usumacinta region demonstrate clear differences that mark a clear boundary between the two kingdoms.
Answered by The Community. Making the world better, one answer at a time. Steel is not usually considered a composite, as it is macroscopically homogeneous. However, some steel types, including classical iron-carbon steel, can be considered as metal-matrix composites, as they contain a second phase... sometimes.
They 've made significant improvements to the stuff now.â. Composite decking typically consists of some type of plastic material, such as polyethylene and/or polyvinyl chloride, and wood particles. The plastic may be from recycled products, like milk jugs and soda bottles, or it might be made of virgin plastic.etter grade materials run a bit more in cost but tend to require less maintenance and have a longer lifespan than those on the lower end of the spectrum; this is true for both wood and composite decking materials.