The subject of technology is treated in a number of articles. For general treatment, see technology, history of; hand tool. For description of the materials that are both the object and means of manipulating the environment, see elastomers; industrial ceramics; industrial glass; metallurgy; mineral deposit; mineral processing; mining; plastic. For the generation of energy, see energy conversion; coal mining; coal utilization; petroleum production; petroleum refining. Also Read: 9xmovies