CD is made up of a bit of aluminium coated with clear plastic 12 cms across for producing sound. Aluminum occurs in igneous rocks chiefly as aluminosilicates in feldspars, feldspathoids, and micas; from the soil derived from them as clay; and upon additional weathering as bauxite and iron-loaded laterite. Bauxite, https://hafizk429hqz8.wikifiltraciones.com/user