URLGRAFÍA
https://www.areatecnologia.com/TUTORIALES/PROPIEDADES%20DE%20LOS%20MATERIALES.htm
https://www.ieslaaldea.com/documentos/tecnologia/piedraceram.pdf
https://www.iseron.com/varios/MaterialesMetalicos.pdf
https://www.gerencie.com/materia-prima.html
https://www.slideshare.net/miriamgil/materiales-ceramicos-presentation
https://www.slideshare.net/informatica4/materiales-textiles-5558246
https://users.movinet.com.uy/~ingeobra/Madera%20Tipos.htm
https://html.rincondelvago.com/materiales-plasticos.html
https://www.slideshare.net/informatica4/materiales-textiles-5558246
https://users.movinet.com.uy/~ingeobra/Madera%20Tipos.htm
https://html.rincondelvago.com/materiales-plasticos.html