Memory MATTER AND ENERGY, CALP, YEAR 1Versión en línea Listen, read and match. por Rafael Rodríguez Pérez Mixtures are made of more than 1 thing. Energy can be produced from non-renewable sources. Materials can be rough, smooth, soft, hard, rigid, flexible, transparent or opaque. Energy can be produced from renewable sources. Materials can be natural or manufactured. Pure substances are made of 1 thing. Some materials change their state.